<human>: Can you give me a shortened version of the text?

So as the title states I've been reading my boyfriends text messages.

To start with: we've been together for about 3 years.

A few months ago I had a bad feeling about one of his friends and low and behold I found out they slept together. I confronted him about it, told him I looked at his phone, he admitted to it (after a LOT of probing), things haven't really been the same since.

Naturally I don't trust him because of this so I still do look through his messages. I don't know if he knows this. I don't do it often and I just do it for my own peace of mind until I can trust him again.
I saw some messages this morning between him and his (also female....all of his friends are female) best friend talking about his house-mate [F/22-23?] and how she was "so fucking hot" and he was looking down her top. Nothing has happened between them apart from him looking at her but I feel like something will, especially since they live together.

Obviously, not okay with this. The thing is, is that I don't know how to confront him. Last time I almost had a panic attack trying to tell him that I looked through his phone. He knows I don't trust him. I want to confront him about this but I don't know if I should just break up with him and leave it at that instead of confronting him about it. 

/r/relationships, what would you do? Bail immediately or confront him about it?
<bot>: Looked through my boyfriends phone after finding out he cheated on me, also found he has the hots for his female house-mate too. Not sure if I should just leave or confront him.