How much is enough?

No, you're not being too possessive. Your boyfriend should want to see you every opportunity he gets, otherwise you two are on different wavelengths. You are not crazy; you miss him more than he misses you.

It's sad and I know it hurts, but you should probably break it off with him. I can only see you getting hurt in the long run, and there will be others out there who will come running to you every chance they get!

Ever notice how when a guy is in love he ditches all his guy friends for his sweetheart? This guy isn't doing that.

I'm not one to have a lot of confidence in long distance relationships. They take a lot of work and it is easy when you get off into another world to get all absorbed in new things. He should at least want to see you all the time, and make every effort to get there. Maybe you could alternate who travels or meet somewhere half way. There are ways. But it doesn't sound at this point like he's terribly concerned about making it happen.

I think that if he thinks seeing you every 3 weeks is ok then he obviously is not a good boyfriend. A boyfriend needs to want to see you and be with you, not all the time but at least once every couple weeks.