What often happens is that guys push themselves away from a girl after a permanent breakup (out of sight out of mind) and maybe a few months/years later they suddenly start thinking about them and think about making contact (seemingly forgotten lying in bed crying in the foetal position in the afternoon yet still in your pyjamas) but's that becomes extremely difficult after so long without contact. Then you think maybe they're with someone or even married and you think do I really wanna find out, it's guaranteed to bring those depressing thoughts back. I knew my ex was with someone else and she used to phone or text wanting to meet up and i either never replied (even turning my phone off and not giving new number) or made excuses not to meet and now I've heard nothing for 2-3 years. ps If you fall in love with a best friend and you split up then you never go back to being friends, I don't know about women but it's impossible for guys, those that do are just repressing or suckers for punishment.