Just gotta say this to your H: Grow Up!! You handled the ring incident well and I give you credit for that because I would have lost it. The ring symbolizes his being faithful to you and is NOT something he should 'f' around with. Faithful . . . sometimes . . . on his terms . . . when he feels like it? Sorry, just venting!!
We had a similar situation - H going to bar (after playing sports) without his ring - so I did a 180. Went out with GFs and left MY ring on the bathroom counter with a sticky note on the mirror telling H not to wait up. Also went to church a couple times without MY ring and that really bothered H. Anyway, he wears his now, even on Friday nights for sports and beer and he's always checking my hand to look for mine.
If you really want a child, go to it because it is an amazing experience. Just go into it with your eyes open, knowing your H as you do. Best case scenario is that H enjoys fatherhood and grows up and worst case is H never grows up, splits, and you become a single Mom. Not the easiest for you, but doable because you are strong.
Also went to church a couple times without MY ring and that really bothered H. Anyway, he wears his now, even on Friday nights for sports and beer and he's always checking my hand to look for mine. 
