<human>: So my boyfriend and I have been fighting constantly for the past three months because I found out he was lying about sleeping with another girl a year ago. I broke up with him last week but now I feel like I should've been stronger and stayed in the relationship. We still hang out and when I asked him how he felt about me he said that he still loves me but doesn't trust me because I've tried breaking up with him so many times over the past three months. I really want us to be better and stronger again, so what can I do to gain his trust back?

Condense the text into a few key points
<bot>: I broke up with my boyfriend last week and I want him back but he said I need to gain his trust again. How do I do this?