I'm at a bit of a cross roads now and I'm asking a question that nobody can really answer for me but I'd even love to hear of other people's experiences.
I was with Ex for 4 years from when we were 21, we actually had an amazing relationship and he was wonderful support when I lost my mother when our first baby was just days old. I found it really hard to cope and he took over everything, night feeds, day feeds, changes, baths, absolutely everything really 
what I wouldn't give for all those precious moments with my DD back! I went back to work and he was a stay at home dad, a role which I can now look back and say I didn't respect enough at all. I felt hard done by, wrongfully so, that I had to go back to work because he didn't really look for work (in hindsight he was looking after our DD pretty much all the time, I expected too much from him)
Anyway things went on and we enjoyed family life for the most part but cracks started to show when I was made redundant and he started spending all his time out drinking with his mates, we called it a day a year and a half ago and there were very bad times during our break up, drinking etc seemed to take priority for him above our daughter until he met someone else. This devastated me as I think I always thought we'd manage to get back together, however relations between us got worse as the new girlfriend was pushing to meet DD etc but the day after I agreed, he ended things with her.
Anyway now here we are falling back into things, seemingly having fallen back in love etc but I'm wondering are we doomed because of all of the above? Does it ever work? Wouldn't it be awful for DD if we tried and it didn't work? She's 3 and loves spending time with both of us together!
I feel like a teenager asking for advice on something so personal but I just really don't want to make a big mistake and things to end up worse between us.