Why am I feeling strangely disconnected from my boyfriend?

I love my boyfriend and all the things he does for me more than anything. We had so much life to our relationship in early 2014, but I just feel like we’re missing what we had then, but I can’t bear to break up with him, because we both know I wouldn’t be able to take it well. We have never had one fight throughout our entire 22-month relationship. When our son, Hunter, came into this world, we were overjoyed to have someone to raise. He’s noticing that I’m getting detached, but he said that he was never going to give up on me, unless I wanted him to. He’s the kind of person that wants to make sure that everyone’s the happiest they can possibly be. I love him so effin’ much, it’s not even funny. Please help!!!