Why do married men do this

I don’t understand why married men do this. I’ve even searched the internet for answers and can’t comprehend. My husband was spending countless amounts of money OUR WHOLE MARRIAGE on Cam girls/only fans. Just recently he stopped having sex with me, turning me down, stopped paying attention to me. I’m not trying to justify that I am the perfect wife because I am not. But I’m ALWAYS sexually available. I have a higher sex drive than him but never demand it from him. He says his libido is way down now. I’m always here to talk to him, I always listen about his problems at work and do my best to remember everything he tells me. I do everything for him. Cook clean everything. Why does he feel the need to spend all this money on these cam girls??? Is REAL pussy really not as good at his hand and these cam girls? And I figure he talks to them about his day and stuff... so what is it. Was I really not enough that he had to go pay to see some pussy. I swear I don’t think I’ll never understand. I read that it has to do with their insecurities but I literally never make him feel bad about him self. 😞 I just can’t believe this is happening to me.