i guess whats most important will be ensuring that both of them know what transpired before or your subsequent visits may be mis-interpreted and could put lots of strain on everybody. you may also need to ask from the current man in the relationship if future visits will be welcome at all!!!!!

Chance meeting with your ex and your former best friend.

How would you react if you visited one of your best friends who you had lost contact with and found him/her married to your ex-boyfriend/girlfriend and both of them did not know you knew the other before?