I feel so bad for you. I had a few different thoughts regarding this.
1) Your H might not have really been looking to hook up with someone. Some "dating" sites require you to sign up in order to just look at more pages or see information about other people who signed up. He might have just been curious.
2) He is acting irrationally in an attempt to repair his wounded ego. He is deeply ashamed of being LD and is hoping some sexual variety will make him feel HD again and thereby restore his ego.
3) I know you are really hurting but in some ways hitting bottom like this can be an opportunity for growth or change. This is your time to be a "woman in her power" and really figure out for yourself what you want/need from your relationship and stand strong.
"Tell me, what is it you plan to do with your one wild and precious life?" - Mary Oliver
