In turmoil

I have just split up with my partner of five years. 2 years ago I found out that he had an online sex habit, contacting women all over the world and sharing explicit photos and video calls. I stayed because I loved him and wanted to help him stop - because our relationship was great in so many other ways. But as a consequence, I couldn't tell any of my family or friends - as they would have been horrified and insisted I leave him. 18 months ago I then found out he was having an affair with a colleague (with whom I also worked) - caught him videoing while we were in the Maldives on holiday. Again, tried to work through. Now I feel stupid for having tried, and my self-image is wrecked - why all these women over me? I am scared of being alone but know there's no way back.