My (22F) fiancé (M22) sexted a Reddit scammer

Me and my fiancée have been together 3.5 years. We got engaged in April and were planning on getting eloped in September. I love this man. He has been my everything. We have both changed each other for the better and shared everything with each other- or so I thought. Tonight he came to me and confessed that he had sexted people on Reddit on two occasions. Once while I was over seas visiting my sister, and just now tonight. We are currently doing long distance until we get married. We live 4 hours away from each other.
He told me about his porn addiction that kind of led him into this behavior, he said he viewed it like it was just porn, and the first time he did it he felt incredibly guilty and vowed to never do it again. The second time he wasn’t sure what came over him and why he did it. Turns out the Reddit user he sexted was a scammer and is black mailing him. They have a picture that he sent and are going to send it to his contacts in his phone. He claims he didn’t send them money or anything and that the only information they got from him was his Reddit user and a WhatsApp number. I’m not sure if I believe him or not.

It hurts because I felt our relationship was in a really good spot, we were so excited to move in with each other and starting our lives together. My trust is broken because I really didn’t t think he would ever do this. It feels so unlike him and not the man that I know and love. He said the same thing that this isn’t him but I don’t know if I trust that.

He told me that he deleted all access to porn and internet on his phone and computer, and he even confessed to his mom and told her everything about the situation. He asked her to put a child safety monitoring app on his computer to keep him accountable. He told me he’s throwing away all his weed and anything that would get in the way of him being a better man.

I want to believe him so bad but I won’t lie I’m heart broken and not sure I can trust him. I love him so much and who we’ve become as a team. Im so worried that this is going to come between us in a way that I just can’t handle. I feel like I don’t know him any more.

We’re going to meet up tomorrow and discuss our relationship in person. I think tomorrow might be make it or break it for us. I could really use a non-biased perspective on this, I just don’t know what to do.

TL;DR
My fiancé of 3.5 years sexted a scammer and now I’m not sure if our relationship is gonna make it