You had the gut feeling and you knew that things weren't working right now and it would be foolish to believe that getting back together or second guessing yourself right now because of how lonely and scared you are would bring you guys the "Happily Ever After" ending. Some time apart is good for both of you to take a good look at yourselves and maybe institute some changes that you need. It's scary to think that you might not be together again and the odds are against the two of you. Sometimes when something is broken, it will never quite be the same again. The only thing you can do is see what happens in the future. I think a split right now is necessary though.
And don't blame her for not going out or hanging enough with your friends. You chose to hang out with her, or if you didn't really want to and were just doing it for her, you were being dishonest about your feelings. When we get involved with somebody, our time with friends and other areas of our life suffer. It all depends on what is important to you. If hanging with your buddies is more important, by all means then do that. You are entirely responsible for balancing your time and keeping the people that are important to you in your life.
Waking up next to a beautiful girl,
Step outside and say hello to my beautiful world.