<human>: Give me a shortened version of the text

Hey redditors, i know i post on this subreddit a lot. I(20) have lately been fighting with my SO(19) of 5 years. Things havent been this bad since I discovered he was cheating. I told him that i think we need therapy but he does not agree. I love this person and its not something i wanna give up, but he doesnt want to fix things in therapy and thinks that we need to work it out ourselves. The most recent discovery is that he had a message today from someone that i didnt want him too ever again. He said he blocked her and that he didnt message her first. she sent a message saying "that gave me daddy chills". How else am i supposed to think when i see that kind of message? I am at a loss here Reddit. He tells me he cares about me and really wants to stay together but i dont know how to have this relationship when their is no trust.....I have depression and its not easy because all this going on is making it worse. Please help reddit, this is the only place i can go to for help.
<bot>: SO of 5 years got a message from a girl i dont want him talking too, big fight happened and dont know if i should stay with him