I would just stay away from him. I mean look how he is acting towards his partner. You mentioned wanting to split from your husband and that sounds like you have decided that already. Doesn't sound like this guy from work is planning to do the same? But like Kaliope said maybe better sooner rather than later. I would never want to get involved with someone who is involved, too much hurt all the way around. And I wouldn't want to go through it on the other side either.

Sounds like to me he is just kind of playing games maybe for a little ego boost and misses the attention but will likely pull right back again. I knew someone like this tho we were single. We eventually each met someone else and he continued on exactly lile this for a long time. Not worth it in my opinion. Its like a game of push and pull. But usually isnt very satisying after.

You sound like your gut knows just need the heart to follow your gut.