Think of it this way...at least he didn't use you all the way up to the "I do".

He's using you hun. And now ya know! The good news is you have Mikayla. And if she is the only precious thing you get from this relationship than YOU came out the winner.

It's a sad thing about his son but you can't make your "partner's" responsibilities your worries. I'm curious to know if he was married to his son's mother? Could explain some things either way you answer that question.

I'm not sure what advice you were hoping for here but for what we know of the situation it's the general concensus that you should take care of you and Mikayla.

I wish you well!

__________________
Minds are like parachutes. They only work when they are open.

~Thomas Dewar~