I'm trying to put the pieces in my head why your husband just left like that.
Was the marriage relationship rocky? Did he feel used & unappreciated so much so that he felt he wanted to leave and pursue someone else - as in "life's too short for this type of marriage, I'm going to go after what I want before it's too late."
The relationship was rocky, but before he left, he wanted me to come over there earlier and stay longer and seemed to be very excited about it. I've been trying to put the pieces together in my head too. From what i've read about obsessive unrequited "love" it makes sense that he could fall in to that again.