Why would he do THIS after 5 yrs.........*brace yourselves, this is kinda long..but I want your views! Thanks!?

Leave it alone. He is not worth another second of your time. He was playing games and unfortunately you were at the receiving end. The good news is it was 5 yrs ago you had feelings and not today so don't accept the friend request EVER. If you see him then you can be cordial but I wouldn't waste one more second thinking about it.