Before I comment, I just wanted to state that I am just trying to give a point of view. I haven't witnessed your situation firsthand, so I could be completely off.
I have felt the way you do many times and in various relationships, so I can totally empathiz. I think understanding how a man's mind works and how he deals with his feelings would help you a lot. There are tons of books explaining the differences between the way men and women internalize their feelings and show their love. In relationship (eg. 'Men are from Mars, Women are from Venus'). When things get too emotionally heavy for a guy, he tends to retreat. They just need some time for themselves to deal with whatever it is that they are feeling. Women, on the other hand, tend to cling and want to discuss their feelings in such situations. Now, I know this is a very generalized analysis and differs greatly amongst different people. However, I think it would be helpful for you to take a step back and try to look at your relationship through the eyes of your bf. It has to be very intense and emotionally draining for him at times (I know it has been for my SOs). I feel that it's actually healthy for him to take time away from you and see his friends. If you try to keep him from doing so, or make him feel bad about it, you will only push him away. Just because he likes to spend time away from you, doesn't mean he doesn't care about you. I think it's important that you find something, aside from him, that will make you feel good about yourself. In order to be in a healthy a relationship, one had to be ok with themselves. If a person depends on another's validation in order to feel good, they will never be happy. I know it's difficult. If he is always ignoring you and never around, then maybe you need to rethink the relationship.

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