OMG when to throw in the towel?

I have had this person I have been in love with for a long time..I really thought he loved me the same I thought that we were inseparable . But every time in the past when we would take time off I was always the one to patch things up..But this time I just sat back to see if he would come behind me.And it's been nothing for months. I am just starting to think that maybe he is seeing someone else or has just moved on with his life. Or maybe he is just waiting on me as usual. My friends all say that I should like call him if I like miss him. But hell no I want to feel wanted also..So by the end of this month if he hasn't contacted me I am thinking of like throwing in the towel. I like only love him and am not interested in other guys that hits on me..But this has worn me out mentally for months..Trying to like be patient but I just am so hurt with all these thoughts of trying to hold on.Honestly it just hurts to bad.Deep down inside I KNOW he loves me so I don't get it..But I can't allow this hurt to drive me insaine this hurts like so so bad but in order to like heal I think I have to give him up..