I want this from different point of views...
When I was pregnant the father was with someone else and they got engaged and giot her pregnant but she got an abortion as he cheated on her... couple of months after we have got back together and are currently living apart as he moves up in December but I suspect he's cheating again he's been hangng around with his ex again drinking but denies that anything has happened and says they are just friends.
What do you think?

I was thinking of sending his ex an email and letting him know... would that be a good idea?

It sounds like this guy has a history of cheating. He got you pregnant, moved on to someone else, got her pregnant, and then moved on again. He has a bad history. I think you should dump this loser. If he is the father of your child, it would be good if you can keep some sort of contact with him. But, I wouldn't make the mistake of going back into a relationship with him. I think when you need him most, he won't be there for you. If he is hanging out with his ex and they are both drinking together, it's likely that they have fooled around together. I'm not saying it happened, I suppose it's possible that they are just friends, but it's something I would be suspicious of. Maybe he really means friends with benefits. I wouldn't email his ex, after all it's not her fault, she probably doesn't even know that he is with you. I would just tell him that there is no way you two will have a relationship in the future. This guy sounds like a player. Just the fact that he is a long way away doesn't mean he would cheat, but you have to look at his actions in the past. I would get out and meet some new people, and let this loser do what he wants. Ask some friends or co-workers to set you up with someone nice. I wouldn't waste anymore time on someone who is unreliable.