Just when i thought i forgot him.. he reappeared and i just remembered why i loved him more than the others?

About a year ago we stopped contact for good.. Back then He knew i adored him but he lost interest in me obviosly and had a girlfriend and refused to have a closure with me back then,, so i was insulted and hurt deeply.. Now a year from that day u met other guys, well as i thought started to have feelings for another guy who is very close friend but ts complicated coz he already got a gf.. Anyways, im trying to convince myself that i can love others than the first one... But when i saw him in a party after one year of the day i fought with him.. I had those feelings again,, "why i loved him not someone else",,, the way he smiles, the way he talks, move, looks, the way he thinks and express himself,, how shy he can b sometimes but cover it up with a cold look.. I adore him.. I couldnt stop myself from starting a convo with him.. Then the rest of the party he acted liķe i was invisible :( i want someone just like him,, i know hes a good hearted person although he is hurtful sometimes... The thing is ,, i dunno wht to do,, how to act ,, how to treat him when i c him from now on,,.. I want to forget him but i love him,, :(