I am worried my husband cheated tonight.

My husband and I have had a rough few months with lots of stress and not much time together. Neither of us have been very happy. Today was rougher than usual. I took the kids to an activity, and he said he was going out to dinner with a friend before she moved away. They had dinner and drinks and he's still not home and not texting me. I have never felt like he would cheat before, but I can't help but feel sad tonight. Any advice or thoughts?