I’m really sorry you’re going through this.
I think maybe it’s too soon for you to be getting out to socialise - not saying you can’t, obviously, but it does sound like you’re experiencing a lot of emotional upheaval and stress right now, which would have made it difficult for you to be fully “present” at the tournament. It might be better to focus on what needs to be done right now, practice good self care in the meantime and just do your best to hang in there.
Also, I wouldn’t recommend marriage or couples counselling if infidelity (or, speaking more generally here, any kind of abuse) has taken place. Most cheaters seem to weaponise the concepts and turn things back on you - some therapists even end up on the side of the person who cheated, too, which just makes things worse for the faithful spouse.