feelings come back

The worst thing about ex's whether its and ex boyfriend or ex girlfriend for guys is when feeling come back and you start liking them again.  Me and my ex are like closest of close friends it was a very modest break-up but now i like him again and he has a girl friend.  Should i tell him, or not so many decisions i mean i don't want to be a home wrecker or anything, but he's not catching the hint.  sometimes boys can be soooooooo  clueless.  But girls who have this problem i have come to the conclusion if you know the boy you should no something special about him no one does, thats the way to his heart.  Don't just barge in there flaunting yourself because thats kinda hoe-ish the dude you like should be giving hints if he's not back off so you won't get embarrassed.  But most likely you have to do something special.  If you stick to the plan you should be alright, so be anti-common and live your life, yours truly.