Is it worth redeeming?

Little bit of a rant. I was dating a guy and after eight months of dating we ended the relationship in January. We stayed in contact because we were friends/friends with benefits for seven years before we dated. I found out that a month and a half after our breakup he told me he had sex with a girl who lives in the same city as him that used to be his college fling. I know it’s not of my business and shouldn’t have because we aren’t together… But this broke me. As someone I have known for seven years, I loved this man, we had planned a future together and went engagement ring shopping, looking at houses so we could move in together. The whole nine. So, I am having a very hard time letting what he did go. I can’t understand how he would want to propose but choose another woman for sex. He told me he wanted to be with me when it happened and still wants a relationship with me now. But every conversation we’ve had since I found out has ended in an argument. I told him right now I am still interested in him but I currently don’t want a relationship however, I would appreciate him being apart of my healing journey by being there for me. And because I said I am not ready for a relationship, he said there is a possibility of him dating/having sex with other women because I could always decide not to date him again. I have every opportunity of dating him again. Which I’ve expressed. I just don’t feel ready or comfortable to date him at this time. I am so scared not to date him like “right now” and he has sex with more women that put me in my feelings and then we restart this process again. After what he said, is the relationship even worth redeeming? I’m so tired of arguing because I’m feeling hurt and betrayed.