I just know from my personal experiences and the experiences that I have read with others that while he may say these things like "us, we and ours" and talk about the future, it doesn't mean a single thing that what you are heading towards is an official relationship. One day, he could meet some wonderful girl that completely knocks him out and that his behavior toward you could suddenly change 180 degrees. This is the part where you get hurt, and you THEN ask him "I thought we were moving towards something together?" Then the dagger in your heart response of "I never said anything about us being official together". Sorry if I'm describing a worst case scenario, I just don't know if I like his approach and behavior to this situation.
Talking about other girls in front of you and then dodging the question of "Is she your girlfriend?" just seems wrong to me. My freshman year of college, I dated a girl off and on for a long time. She was head over heels for me and we started hooking up being next door neighbors, going to parties, etc. etc. We had some classes together and I remember one time we were at a friend's house studying, and the other friend asked us "Are you guys dating?" flat out. I was completely taken aback by the boldness and didn't have a response ready and was enjoying the current arrangement, not really officially dating and all that. I just quickly blurted out "We are just really good friends." You can't imagine how much that hurt her. We still continued to date(ish) and she felt powerless in her feelings for me so she put up with this kind of behavior for a long time. The more I got used to her being there with my bullshit, the more comfortable I got. Keep in mind that response to our friend was after a good semester and a half of hooking up and it was pretty obvious she wanted more. Eventually I did make it official through her nagging moreso then anything else but not much changed and my treatment of her continued to be substandard. I just don't want this to happen to you.
So his best friend went on a date with a girl and she wondered after 4 dates where this was going. It's bold, to the point, takes a bit of the mysterious "whats going to happen next" fun out of it, but in this girl's defense, she knows what she wants. Time is too short to waste and she wants a relationship, that is pretty obvious. I'm not saying she is going about it the right way, it could very well scare many guys away putting alot of pressure early on, but through this she can weed out the guys that aren't serious. There is a very fine line with being too relaxed and too overanxious for a relationship. I just feel like if a guy liked you, and it's pretty obvious that you like him, he'd be proud to be with you, talk about you, and would take more initiative. Even moreso then just you letting him do the statistical 75% of the pursuing. It's not like you are making it very hard for him, I don't think you have ever really said no to him yet have you? Don't let this lure you into a false sense of security thinking that he really has serious feelings for you.
You might be scared of being honest but if you are holding yourself back just to impress this guy, where are you really going? I understand that maybe you are a bit hesitant since your last relationship but if you want to be in a relationship with him, you are going to bring it up sooner or later. If you just let him do whatever he wants with you, it might not be exactly what you want in the long run and all this time you will be building more and more of an attachment. You may be in love with the idea of him since you have so much in common, but no matter how good it looks on paper, it doesn't always translate that well into a relationship. He could have some serious issues that will come out as soon as he lets his guard down, which won't happen totally until you guys are officially together and get nice and comfortable. Eventually you are going to have to decide if this guy fits your best interests and gives you the treatment you think you deserve. Because if he doesn't, there will be others, and those opportunities are passing you every day unnoticed as you have your focus on him.
I'm not saying he is a totally bad guy, don't get me wrong. I just recognize alot of my immature behavior in him, and the truth of the matter was I was very oblivious to it at the time. He could be the same way. "You haven't mentioned anything, so you must be okay with the current situation" could be the message you are sending right now. Just some things to think about. You don't need to take immediate action, but if things don't progress as time continues and you feel more anxious to try and snare him, it could build up alot of tension and it could come out the wrong way. Don't become satisfied with what you are getting if you want more. And if he is keeping his options open, so should you. Nothing like a little pressure to help your situation out right? I just don't think he has the right mentality going into your current arrangement. He wasn't looking for a serious thing coming in and it rarely happens that people change their mind. I went into it not seroius with my ex and told her flat out, and she hoped I would change her mind. Eventually I did but we ended disasterously because of my poor treatment of her after I got really comfortable and my issues that weren't settled before I went looking.
Love is a great, powerful feeling, but it does not conquer all and don't assume it will magically turn him into your Prince Charming to pick you up on your white horse and carry you away into the sunset telling you how much he loves you and wants to be with you forever. Too many times have we even been in serious relationships saying the things he says to you, but yet feelings change, things change, and we don't mean them anymore. Yet we can't take back what we said. I hope this gives you a more rational perspective and helps you sort out what you want and how you feel. Good luck with everything.
Waking up next to a beautiful girl,
Step outside and say hello to my beautiful world.