What the hell?

My boyfriend and I have been together 3

Months (not long) and he talked about his EX all the time, and they hangout at his house all the time. Well anyway tonight he texted me with pictures of them hanging out and I said "why are you sending me these?!?!" Because he knows how I feel about her (hate her guts) and he just kept saying "were just friends!" And I said "no! Your just friends with her, she likes you more than friend D's!!" And he said if we can't trust each other than what the hell. And I just don't know what to do anymore. I love him so much and yet he treats me like crap all the time. Like I'm his second girl. Like I'm his second choice.

Ladies what the hell do I do?