Wow, your an insecure little one aren't you?...
Theres nothing you can do, and by phoning your BF all the time you are showing him how much you dont trust him. Why are you in a relationship where you dont trust your BF?
He is already angry/annoyed by your constant phoning, and this may be for a number of reasons, but I can think of two main ones;
1. He's a cheater and he's on the defensive.
2. You've pissed him off to the point where he doesnt care any more, and will now go out just to make you angry (get revenge).
By phoning him when he is out, you ruin his fun. Do you understand how much of a downer it would be if you got the messages you sent when you are out?
OK, he's a bit insensitive by not seeing you after he's gone out, and by not understanding how you feel (maybe he does), but its not his fault you dont trust him. Unless you have reasons... Do you??
There is no point in making him feel guilty for having fun with his friends, this will only give him reason (make him think "well if I'm going to get blamed for doing shit, I may as well give her a reason to be angry").
Mick
*MaJiK*
There are not many things I fear in life, but disappointing you is my greatest.
I love you even with your flaws... I love you because of your flaws.