My wife does voice this complaint about me.
When I was younger I had a lot of friends. We all worked together, hung out all the time, had no responsibilities and did lots of things together. Then I moved further away when I got married. I found myself maturing in a lot of ways and changing my mind politically - and those friends I had seem to have remained "stuck" in that college mentality. They haven't moved on or matured in the same way that I have. So I feel in a lot of ways those friends are part of a relationship that I've moved on from. I still value them and the time we spent-but frankly, they've become angry conservative people in many ways and aren't open minded about the things that I am-and I don't want to be around that.
Then, as others have said-I feel like my life is just constant work, then come home and enjoy some time with my wife and daughter and do other family responsibilities. I don't know where I would have the time to foster a new relationship. When I get a rare break with no work, errands, household responsibilities, etc-I just want a moment to myself for fucks sake-so I can stare at a wall for 10 minutes without someone needing something from me, or something being picked up or delivered, not having to call or schedule something or take something in for repair. I just want to do nothing with no one for once in my life.