Hi OP. I’ve been through a similar situation with my ex.
I was looking through his history on his laptop as I had suspicions he was up to something and I found an e-receipt for a payment to a cam porn website. I was pregnant at the time, he was living in my house, he had money issues and we were supposed to be saving money for the baby.
Personally I dislike porn, it’s not something I use and I dislike it’s use by partners, but it is their choice if they do, it’s not a dealbreaker for me. But on the site he was using it basically enabled him access to 1-2-1 live porn where he could interact and direct the ‘show’. The interaction was the thing that got me. It crossed a boundary.
Anyway, I confronted him about it, said that this was his final warning, any further instances of similar behaviour would mean that we were over. Naively I gave him a second chance, looking back now, I shouldn’t have.
When our DS was maybe around 4 months old I found he had done the same again, but this time had also swapped phone numbers with one of the cam women, she had searched for his phone number on Facebook, found his and my profiles and was trying to blackmail him for money. When he realised he was going to be exposed by her he confessed to me.
He was kicked out 2 days later.
Money was tight due to me being on mat leave, I was running a very tight budget and he was spending money which should have been going into the household budget, and by extension for his son, on porn. Abhorrent.
Plus he had swapped his number, he could never explain why he did it, if he wanted to meet her or try and get some dirty talk from her at a time when my PND was hitting badly and we weren’t having sex.
Anyway, he was kicked out back to his mothers and I don’t have to deal with his pathetic behaviour anymore.
I hope you make the right choices for you, he’s clearly not been thinking about you or his family properly for a long time.