Trust Issues.

Being a psychology major I suppose you can say it is in my "nature" to psychoanalyze the situation I'm in to better understand things. I tend to Psychoanalyze my boyfriend and at the end of it I'm left sad/angry/disappointed. Don't get me wrong we have our amazing moments. He laugh, make jokes, have our intimate moments...but we're changing.

Problem #1)
There have been plenty of times where I could go an visit my boyfriend at his school and hang out of course. But when ever I bring up the idea he finds excuses to stop me. "Oh I don't want you walking alone" or just gets mad at me and eventually stops me. When I do get the chance to go he seems to act strange. He hardly talks, observes a lot, he watches what he says etc. We leave the school and he's himself.

Problem #2)
All I ask of him is a phone call everyday after school. I don't see him so often as before so I obviously miss him. I'm dorming at my univ. and I come home weekends to see him and my family. I ASK FOR CALL. He comes up with the excuse that he doesn't like phone calls. When we do talk he hardly has anything to say. I get sad...and blah blah blah.

Problem #3)
I found another girls name in his PERSONAL belongings. He insists its just his friends girlfriend...blah blah blah. Expects me to understand. Does not fully explain his side of story. Gets mad. etc

Problem #4)
He gets frustrated by me and we fight. Sure I might get snappy and needy. (i have my reasons) He pushes himself away. Withdraws. Shuts down. We have been fighting for the past 2 weeks. It doesnt seem to end.

It's hard to let go of something you've held on for so long. It's not that i'm used to him being around me...or that it sickens me thinking he'd be better off with a different girl. (other than me.) I'm insecure, i have trust issues...average(maybe not so avg.) girlfriend shenanigans.
Help.

ON TOP OF THAT I SUFFER FROM MAJOR DEPRESSIVE. WAS DIAGNOSED WITH DEPRESSION TWO YEARS AGO....I ATTEMPTED SUICIDE AND SELF MUTILATED MYSELF. (PUNCHER AND CUTTER)