Expert Jo says:

This really is a tricky dilemma but I think the answer lies in the degree of attraction you feel towards this guy. If you think there could be something lasting and wonderful between you two then I believe you should go for it. However, if you think it’s probably going to be just a fling then stay away. The likelihood is that if you date him you will damage your friendship with your best friend so I believe this is only worth the risk if you think true love lies with this man. Your friend and this guy are over so you’re not doing anything wrong by dating him, but please be forewarned; your friend will be upset for a long time if you do, so he has to be worth the risk.