What do I do?!

My fiancé and I have been ttc for a few month now not taking it very seriously and just kind of going with the flow and the theory of whatever happens, happens. Well 2 weeks ago he came home from work and was a completely different man. He said he couldn't be around me any more and he needed to leave and just have some space. Two days later I find out I'm pregnant. I call him and tell him and the first thing he said was "well take care of it, it's not a good time" 
Abortion is never something I ever thought I'd be considering no matter what the situation. I have 2 kids and the thought never once crossed my mind and I was a lot less ready then.
I just don't know what to do or how to feel. I don't know what the future holds for him and I. I of course don't want to be a single mom of 3, but I know I could do it at the end of the day. 
I just don't understand how someone can go from saying they want to spend the rest of their life with you and they want to have a baby with you to just cold shoulder. 
I just want to be excited for this baby and have life go back to the way it use to be :(