living with your ex for the sake of your kids

I really need an advice of sb who's been in the same situation.
I've met this wonderful guy a month ago and we've started dating. But just recently he told me a shocking story: he has a 5-year old kid and still lives with his ex-gf in the same apartment for the sake of the kid. He's almost 24 and i'm 21. I know that their kid was never an 'accident' and, even being a young couple, they did plan for it. I really like this guy and it seems that he likes me too. I'm just really worried about his living situation. He told me that he's not planning for the future, as he can't really do that in his situation. He has a good job and has been very successful throughout his whole life. I really want to make things work for us, we fit each other really well and are having a truly great time every time we meet.
Do you think i can trust him? How can i be sure that he's not just cheating both of us (me and his ex-gf)? I hope to get to know which worrying signs i should look out for. What exactly should i ask him or do in order to make sure that it is in fact over between him and his ex-gf and they are together just cause they don't want to hurt the kid's feelings.

I know that i'm really young to accept that kind of "baggage". But being honest i don't mind him having a kid at all. I actually think that makes him a great guy and adds to him as a person a lot. The only thing that bothers and troubles me a lot is his living arrangements. He is an extremely busy person and is almost never at home, he told me that his kid and ex-gf have a separate room, but still...

What do u think? Should i trust him? Or should i run away?

Thank you very much. I really hope to hear from sb soon...

It is very difficult to guess what a person might do in the future. However I find it would be very hard to except the living arrangement that he has. I don't think his ex would enjoy having you around, so ever going to his place would kind of be out of the question. the fact that they have obviously had sex in the past and are still living together sets the stage for them to try to patch things up. I find it hard to believe he is there for the sake of bthe child. I may be wrong, but when two people can't get along they will separate no matter what's at stake. case and point he may still be sleeping with her. unless you have witnessed him sleeping by himself I would keep that in mind