@hawkster1,
You don't need that in your life....
1) this is a man that will never commit
2) if he has a mental illness, it takes a lot to deal with someone like this, especially when they go off their meds, his wife is probably already doing this for him, why should you?
3) if he'd do it to his wife, what makes you think he wouldn't do it to you if he ever left her?
My advice, just because you can relate, you are focusing on the positive. Look down the road one year... The friendship butterflies are gone. Those things that once seemed cute aren't so cute anymore... Etc...
Only you can make the decision to let go, that's a lot of baggage to deal with...
Some people come into your life as a blessing, others come into your life as a lesson. Not all people are meant to stay in your life, sometimes letting go is hard but it leads you to the right places.