I know this probably sounds old fashioned to some. I have had friends of opposite sex in the past but I have known their partners, have known them a while, they knew my ex or we were young and I didn't give it any thought.
I am divorced and in 40s and I feel that what might have seemed like simply friendly behaviour might now be seen as flirting.
I have a work colleague I like as a friend. Our team occasionally go for drinks after work. Sometimes just a couple of us. The colleague I am asking the question about however has a long term partner. I love chatting to him but wouldn't go out after work just the two of us as I don't know if that is ok?