Looking for Advice Regarding Husband

I’m not looking to leave my husband and we are talking about going to therapy but it’s just really hard finding someone.

I’m not mad about men watching porn. I know it’s a sensitive subject but I’ve never minded it. So, turns out because I didn’t mind, my husband took it as he can just watch it every min of everyday and basically got addicted, that alongside him doing naff all around the house. After nearly 3 years of me speaking to him gently and asking him to stop watching porn and start helping around the house, I told him I’d had enough and I was serious if things didn’t change, I was leaving him (I was dead serious!). After nearly such a long time he agreed to go cold turkey on porn, help me more around the house and that’s exactly what he’s been doing for nearly a month now just changing and bettering himself BUT here’s the issue.

While he was going through what I would call an addiction (he would probably disagree), my sister came to visit us and whilst me and her were chatting, he was watching porn! With my sister sat in the room. I had to go sit next to him to make him stop because I knew he’d minimise the window if I sat next to him. This is such a trigger for me and something I don’t feel I can ever forgive or forget. It literally makes me sick to my stomach, I’m thinking what if we had a child, and he does that in front of them, or if my child saw that and talked about it in school, he could get arrested. It’s absolutely honestly putting me off having kids with him. I dunno if I’m overreacting but it’s sickening to me and it just puts me off him so much! He’s not a ‘creepy’ person even though what he’s done is creepy. I just don’t know how to approach it. I don’t want him to think he’s trying for nothing but at the same time, he makes me sick!

What would you do?