Should I leave my husband?

I found messages from my husband to a woman I discovered him sexting a couple years ago. He insisted then that they never got physical, but I think he’s been lying to me for years. I’ve caught him doing this 4 times before and forgave him every time, but I don’t think I can this time. These messages are some of the most heartbreaking things I’ve ever read.

I don’t know what to do!! Every time I catch him he throws the blame on me, that I don’t give him enough attention or sex. The sex is not good for me anymore, I’m not into it. Is it my fault, am I supposed to just suck it up? Help me please!! This has destroyed me, I’m so angry I can’t think straight.