Am in crazy depression people i need advice i feel suiciding ..?

tats my story the girl i liked for 7 months and who said she liked me too but didnt wanted boyfriend we were in love i could feel it but she said she didnt wanted bf yett was waiting few days agoo she went to a party some guys made her smoke weed she grinded on tons of guyss and next day made one her boyfriend she only hang out with him 2 times i told her am hurt all she say is sorry oo after the party her personality changed completelyyy i was so stuned i even tought it was someone else she was talking ual and stuff she told me she dont care if they want she will ride it everydayy while she w a good virgin girll before above the influencee now amm super depressed i feel suicidall :(