AIO for packing up all my things and leaving my man after I found evidence of him being DL

We were at the club last night and he already was not in the best mood. But we ended up lifting our spirits and having a good time

towards the end of the night, there was a guy that seemed to be flirting with him in my opinion. he was at least 15 years older than my man. him and I are 27. I kept looking at my man, wondering why he was even talking to this guy cause why entertain anyone who is flirting with you in front of your girl? And when I addressed it with him, he got really frustrated. We ended up leaving. He couldn’t even have a conversation with me about it, granted we were drinking, so I guess I’ll give the situation some grace because of that. But a simple conversation wouldn’t have hurt at all. I was getting frustrated because he was trying to avoid the talk completely.

When we got home and he fell asleep, I did the forbidden thing and looked through his phone. I saw his best friend sending him Kissy faces. I saw him DMing guys I’ve never heard of, some married with kids, and they were trying to meet up with each other. Some of them sending heart eyes for his workout story posts. He would like those messages and they’d talk about their physique. He even talked about wanting to get pounded by them. Amongst many many many other things, like I saw a lot!

This morning I just packed up all my things and left. I’ve told him I thought his best friend had a crush on him and treated me weird and he denied it. I told him a long time ago that it would be completely okay if he was bi or gay and he denied it, and after seeing this I just couldn’t even take it. There was no reason to lie about any of that.

We briefly talked about it and he denied it and I said I had proof and then he neither confirmed nor denied it. But I’m wondering if I’m a bad partner for just leaving? Should I have talked with him and approached more kindly? Him lying to about that was completely inconsiderate but I know stuff like this can be touchy. We had an amazing relationship and a great friendship but this is just soooooo uncalled for. Lmk what you think