Hi J.,
I think a lot of times people (men especially, not to generalize) don't really understand the difference between lust and love. they think being 'in love with you' is when it was all fireworks and he couldn't wait to kiss you. Then when it 'settles' into something (which we know is actually MORE than what it was) they feel like they love you but are not 'in love' with you. Which, I think, is why men can be vulnerable to other women - they get that fireworks feeling of 'newness' and with you it's just groceries and kids school stuff and planting marigolds which doesn't seem like love to them.
I ABSOLUTELY think you can get feelings back - or explore how to build them to the next level. Not that you actually get them back, but that you discover what your expectation is for 'being in love' vs 'loving you' vs wanting to get you in the sack.
I think you should ask him (and guys won't usually be good at this) what it is that makes him feel like he is 'in love' vs 'loving you as a friend'. Maybe it's something really simple that can be altered just with a new definition. Having a 7 month old and a 3 year old sure does suck every ounce of life right out of you.... how much time do you set aside to be his 'wife'. I ask that, not to put ANY blame on you, but to recognize that as moms we tend to put kids, house etc all in front of hubby. Which makes him feel 'not special' which can wane those feelings of 'being in love'.
So, counseling is a great place to start to figure this all out.
Do you have date night? Doesn't matter if you just said 'omg, no way i can fit in date night.' DO IT!!!! You both need it. Once a week, if you can. But every other week is NON-NEGOTIABLE. Treat date night like water or oxygen. You can't survive without it.
Good luck!