Thanks for bringing your question to Just Answer.
I fear you won't be happy with my reply, as I think that this man has been using you. He knows that you are lonely and unhappy from watching your marriage. He also probably figured out that you are pretty good at taking care of other people, after being married to an addict.
You have moved too fast in getting entangled in this man's life by putting his bills in your name, etc. Now he's pulling back, and when he finds someone else, you're at risk of being left with his bills.
Please protect yourself by taking your name off his bills. You may have real feelings for him, but he's making it clear by his actions that he doesn't feel the same for you--but how convenient that he decides to be just friends again after you have taken care of his life and his bills for him. He cannot be much of a man to take advantage of you like this --especially knowing what a hard time you've been through.
Your actions (marryng an addict, caretaking this man) are suggestive of a co-dependent personality. A co-dependent puts everyone else's needs before her own. There's a classic book on the subject that you should read: Co-dependent No More
I would also recommend therapy so you don't keep picking the wrong men. There's also a support group for co-dependents.
I hope this gives you a new perspective on this situation. Please click Accept if it has.