Am i heartbroken or what?

Theres this girl i met 2 years ago online, we became buddies, chatting everyday on cam... She lately disappeared for like 6 months and yesterday she came back... She used to love me, but sometimes she had her moments where i got ****** up and .... i told her miss her and i love her yesterday... she says i miss you too but sorry im with someone else. We were gonna meet pretty soon. Tell me what would you do if u were in my shoes... i couldnt sleep at night, ive been banging my head because of jealousy and misery, and i cried myself to sleep and experienced some bad nightmares about her.... im heartbroken i just... i dunno what to do... i wont say im gonna kill myself because nobody is worth killing yourself for... I just feel pretty bad and killed from the inside... Any Advice?