Wow! Thanks for your replies.
I can't emphasise this point enough but he is different to how he was with me back then. Which makes me genuinely believe he was in a 'bad place' at the time cos he acts nothing like he did then. And I must stress that all of this happened months ago.
He is a different person, however I think if I was trying to change him or had a hand in changing him I would have made sure he sucked up to me big time and he hasn't done really. So I guess I'm saying that whilst he is a better person and I believe he wouldn't do this again, he hasn't exactly been all hearts and flowers since.
But we have weathered the storm for more nearly a year now since he did what he did and whilst I feel 'satisfied' he isn't sticking his dick into other women or even contemplating doing so, I still don't think he has properly addressed the situation. Whilst he was very open and honest about screwing these 2 other women in the past (I didn't even have to 'prise' it out of him, he was matter-of-fact about it. Sounds shocking really when I put it on paper), we have only really discussed it cos I've brought it up countless times.....to the point where it's doing my head in.
I don't know what I was expecting in this situation. Him to be on his knees grovelling for my forgiveness and begging me to stay? Cos that didn't happen. I got a very factual, "I want you in my life, I want to be with you, at the time I did all that stuff to you I wasn't entirely sure what I wanted but now I am. Can we please move forward?"
But I can't just 'move forward' without exploring/resolving my feelings on the matter. I have started to trust him. He said very matter-of-factly to me "I treated you like a dick, I was a twat with you. I'm clinging to the hope that you will realise I wasn't myself at the time and the changes you have seen in me are me going back to my old self, how I used to be before I was a mess. I was with ex for 12 years and never once looked at another woman and that's how I will be with you. I'm just not interested in other women'. Having contacted his ex on FB she backs up his comments whole-heartedly and she genuinely has no reason to (She is soon to be married).
With regards to STI's I have been tested, all clear.