So colleague isn't someone I see on a daily basis,she works in a different department,I don't know her that well but I know people who do know her better than I do. I found her long term partner on a dating site,he is looking for fun dates and nothing serious! They haven't split up,as far as she is concerned everything is good. They have a baby together and he is step -dad to her other children. I know I would want to know if my partner was doing that and if it was a good friend of mine I would tell them.