What should i doo..im in love but ....suicide./:?

a little while ago i met a guy 2 years older then me, hes just left school and im in my 9th year of secondary school. but me and him started getting close and he told me he liked me and i told him i liked him, so he said he wanted to to it properly to ask me out face to face..so i was really excited to meet him...we arranged to me 3 days later as i was getting ready i got a text from him saying 'sorry babe i have a girlfriend now.' and i suffer with depression soo im quite a delicate person im told.. and took this really badly..had cut my wrists and everything attempted suicide obviously didnt work. ..but a few days later he wanted to know if i would like to meet him so we could talk about it he was unaware of wht i have done..so i met him.and we got a little drunk and we had kissed and he fingureed me ..couple days later i went round his ..same thing happend again..but it really felt like he was being seriously and liked me ..but he was still with his girlfriend when i txt him he told me he loves me more then his girlfriend..but he stayed with her ..but i talked to my best friend asking her wht i should do.. she hesitantly told me that he is dead serious with this other girl..he brought her a diamond necklace and earrings the whole lot and was guna propose to her..unsure on how that would work as he is 16 and the girl is 14.. but alot of the time he is round his girlfriends house, but h says he doesnt tlk to the other girl...he has recently got a new number but he hasnt given it too me and i dunno why but i had a mive breakdown the other day and txt his old number with everything i wanted to say as i dnt get a chance to see him anymore..and he had txt me back saying who is this soo i told him and he hasnt txt back..and no one seeems to have his new numebr.. im really upset about it and dont know wht to do .. and i know people will probably say ..no one is worth your life or the pain of cutting your arm but it feels right to do it..and im one of those people tht if i dnt feel like one person doesnt like me ...everyones hates me which maks me feels unimportant/unwanted..x