<human>: Long story short me and my boyfriend met back in June. We casually dated until October when we decided to become exclusive. I ended up finding out that he was still seeing sleeping with his ex during this time. After confronting him, he asked me not to leave him and I didnt but only under the conditions that we would become official and that he would have to cut his ex out of his life. He agreed.
This happened back in January but I still have not been able to trust him. I feel like there is a wall preventing us from progressing in our relationship because of this. I feel like he is sometimes shady with his phone, and doesn't display me on any level on social media. I feel like he hides me from everyone and he doesn't want people to know he has a girlfriend. I really like him and I think that we have great potential but I don't know how to get past this. The only solution I see is randomly asking him when we hang out to go through his phone. The only problem is I don't know how he's going to react. I don't know if it will backfire and he'll get mad at me and question our relationship. But if there's anything I need to find it would be in his phone. Is this going to far? Does anybody have any suggestions or tips? I'm at a loss here and I don't know what to do. We get along great but there are times that I lash out and get an attitude with him because I start to think about things. I know I cannot continue how it is.

Can you condense the text into a few key points?
<bot>: my boyfriend previously lied about seeing his ex and I still cannot trust him. Is asking to go through his phone too much?