<human>: I've (24 F) been dating my boyfriend (23 M) for 2 years now. He previously used to drunk call and text other girls about 1 year ago. I decided to stay with him after he told me he would stop and that he didn't understand why he did it. 

It's been a couple of months now (2--it took awhile for the behavior to stop) and I'm having a hard time trusting him. Is this relationship a lost cause? Or do you have any recommendations on how to build trust. 

We don't live together yet, which is making things worse. He also doesn't like his privacy being invaded, so he won't give me his Facebook password.

Can you give me a shortened version of the text?
<bot>: I'm having a hard time trusting my boyfriend after he previously drunk texted other girls. How can we build trust or is this just a lost cause?