Because the infidelity issue will crop up in my mind later, or for other reasons as well? I was a little nervous at how quickly he changed his mind and decided to come home. Relieved that he was coming home, yes, but nervous that he hadn't had a chance to see that the grass is not greener on the other side. I find myself wondering if he'll just run back to OW at the first sign of trouble, though he assures me he's committed to this marriage.
It will be tough because of the sudden turn around, the fact that he's basically coming home like the returning hero, and eventually fears of both infidelity and him leaving again at the drop of a hat will surface.
I think it's fair not to trust that he's in it for the long haul. I would share your concern given how little thought he could have given it.
That's why I think it's important that you start reading about getting through infidelity and keep an open dialogue with your H. He may be resistant to disclosing much about his relationship, but you'll need some kind of closure. There are resources available to help the two of you work through this. He's going to need to work as hard, or harder, than you. I hope he's serious about working things out.
Hoping the best for you.
In the end, it's not the years in your life that count. It's the life in your years. Abraham Lincoln
It is hard to fail, but it is worse never to have tried to succeed. Theodore Roosevelt