I hope you had a nice week-end and were able to get some distraction to be less sad.
It would really be best for you if you didn't know anything about what XH and OW do. Try to tell your friends that you'd rather not know what they are up to. I told my XH the same and so far he respected my wish.
I wish you a lovely week and hope your job is not too stressful. (((HUGS)))