T.C.
That sounds like very suspicious behavior to me. You say this has been going on a year? Hmmm...doesn't sound good.
It would seem normal to me if it lasted only a month or two or something, but a year? Honestly, I would be investigating his faithfulness to you.
My dad and my step dad (almost ex) both followed a similar pattern, and both were unfaithful in the end. I hope that is not the case for you, but this type of behavior, ESPECIALLY that it's lasting so long, is not normal or healthy and seem to be a sign of something else.
If it's not something else, he certainly doesn't sound fully committed. I wonder if counseling would help him?
Regardless of the reason, I'm sorry he is doing this. (((hugs)))