Around 3 years ago a friend of mine dated a guy for about a year. They broke up and my friend has now been with someone else for 2 years who she lives in Australia with, so I haven't seen her since then sadly.
When they were dating we went out as a group a few times, I thought he was nice enough but our other friend couldn't stand him and thought he was a complete prick.
Anyway my friend cheated on him and the relationship was just incredibly rocky, as far as I know they haven't spoken in years, but luckily I think they were civil towards the end.
Anyway he messaged me one day just asking how I was getting on with everything that's happening. I replied and now we have been messaging lots. He seems to like me and I think i'm attracted to him too.
However I feel like it's really unfair to my friend and like a bad person. Obviously nothing has happened, we have just been speaking online, but i've realised I like him.
I think I need to just tell him that this cannot go any further as he dated my friend, what do others think ?