Im f in depressed =(?

well since February i have been kinda of depressed . i lost the Only girl that i have ever loved like really loved she didn't die or any thing but to make shorty story date went bad and she was going though stuff . so i stoped talking to her but then she started talking to me again and i don't want to get any more depressed cause im going to like her agin. i feel my void with shoes and cloths and Electric etc. but it gets me no where . i wake up depressed . im not going to kill my self or any thing . but it feels like im cursed cause any girl i build a relation ship with its all ways fails . i dont know wtf my problem is . im also a nice guy so i dont score as much as my friends . to make things worse . im 18 and feel like im 70 some times idk but if some one could help me would be awsome .