My DH (Then DBF) went through something a bit similar. While he didn't accuse his parents of anything, he in fact had a fairly enviable childhood by any account - mother has some anger issues but that aside, he was always loved, cared for.
We met at 18 and I know that he began pulling away from the 'fold' around that same time. It really was love at first sight, and he put, and continues to put, so much of his affection into our growing family that he is no longer calls home like he used to.
MIL hasn't dealt with this well from the start. She is used to what my BIL's do - call/see her daily. My SIL calls/sees her daily. YBIL's gf is a bit more detached but he (late 20's) still lives at home so they also see her daily. DH calls maybe every other week and we fly out there once a year (although I haven't gone in about two years for various reasons - nothing personal just outside factors.).
The reality is, as DH has told me on many occaisions, he just *isn't* interested in being involved like that with his FOO. He loves them. He does favours for them. He is extremely grateful. But he is happy with his wife, our family, his work, his sports, his buddies, coming home and watching a game.
A difficult transition for everyone.