Massive

Men are very selfish when it comes to the split parenting, they seem to think their own life is frist and then their children. Bet they didnt think of that when they were busy helping creating them, Your children are seeing what alot of kids see i guess, My ds's lost interest in their dad ofr some time once they seen he wasnt really interested in them.
So sad, the responsibilities of parenting can so easily be shifted, and without any looking back. Thats right he is the one losing out because he is missing the most beautiful, simple things your babies do everyday that probably will only occur at certain ages. the more he stays away the less likely it is your little ones will see what it is they find so comforting in him, ie. your little one wanting to come back to you.
They can feel the love and the commitment, they are the best judge of character.. i always trust my kids instincts.
I feel for your kids, not easy being a single mum, but put it this way, i was raised by a single parent, have been a single parent and i am so much better for it...
I hope your kids are ok and that they give you heaps and heaps of extra