I hope you are in a better state of mind. I have spent so much time trying to understand my W that now I am trying to think like my old self to really respond honestly.
The panties.........I don't know if that is a clear indication that he is cheating to be honest with you. This will sound terrible but most men keep things from previous conquest as a sign of accomplishment. I can't say that is the case here but other than the panties what real proof do you have? He was on a dating site? I don't think that really means anything.
When my W was here I was feeling a lot of the same emotions she was feeling, once at work I visited a dating site just to see who was out there, sounds terrible I know but I was curious. I never intended on doing anyone, shortly after she left I was so pissed I actually signed up to like 4 different sites. I ended up not answering any of the emails I got.
Some men sometimes just like to test the waters a little bit to make sure they have not lost their sex appeal. It is wrong and very insensitive, but it is the truth.
Your husband sound like I use to be but I don’t think it has anything to do with how he feels about you as much as it has to do with how he feels about himself and his inability to communicate with you in a way that you appreciate. I always thought I was perfect the way I was, the entire issue was my “crazy” W to the point that she started to believe it. When I look at it now I am ashamed but it took a helluva lesson to teach me. I hope it will not come to that for him or you.
Men think and communicate differently, as I am sure you know, for me action speaks I don’t know your H but I am assuming he is similar to me. What actions? That is the part I am struggling with in your case. The more you share the more I get to know him.