Girl my fiance was sexting sent me the proof, confronted him and found out he ended it but has also been texting other girls. What now?

Anonymous

So, fiance (M32) and I have been together for 10 years. We've had our ups and downs, but all the while we've "stood in love" and worked through things. Two days ago everything was great, and then everything was not. A girl texted my friend telling her she felt guilty reaching out to me, but that my fiance (boyfriend at the time) was sexting her last year. My friend asked for proof and got it. It was on IG, and started out normally but within 2 days escalated to him sending unrequited, random pictures that prompted her to respond with "oh that's naughty ;) I see you"... I can't see the picture but can only imagine.

That happened on my birthday last year, which I spent working. It went on from there, with him calling her sexy, repeatedly texting back and forth, and eventually sending nudes to eachother. The girl claimed she didn't know he was with someone, even though she liked his IG pics, and there are pics of me in there... At first, I didn't know who it was and my friend didn't want to breach her confidence... but through some investigation on my part (literally putting two and two) I found out who it was. A girl friend of a friend we both know.. after that incident she stayed at my house for 2 weeks, and acted like nothing.

He picked me up yesterday, and was asking what was wrong. I asked him to give me his phone. He did and I went to his IG, and those messages weren't there anylonger. What was there were messages to several different girls saying things like "you're gorgeous/beautiful/you're getting a rise out of me..."

He says that the sexting went on for about 1.5weeks, and that he felt guilty and stopped, then deleted the messages. He says with the other girls it's different because it wasn't sexual, even though it was after he stopped sexting with the other girl and went on until about February of this year that I can tell... even when he asked me to marry him in December, apperantly because he was feeling inadequate. I'm so sad/lost.. confused.. what now?

Updates
1 y
This whole time I've unconditionally trusted, because we've talked about cheating. He's been cheated on before, and it's been a very clear hard line for me as well. We've both told eachother it'd be a big deal if either was doing it. He's so sad, and doesn't want to leave me. I'm so sad and heartbroken.
Girl my fiance was sexting sent me the proof, confronted him and found out he ended it but has also been texting other girls. What now?
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