he broke it off, separate himself from co-habitaton, but probably doesn't have a back up plan. which is a good thing, he probably was honest about it not working. However, he's being selfish by blurring the lines. When you break up you have to be fine being alone, or away from the person you broke up with. People aren't meant to be solitary creatures, so looking for comfort is normal, but its unfair to the person you just split from.
Give yourself space to deal with the separation. His disclaimer of it not working only gives him pivots to push/pull with you.