I am so lonely that I want to kill myself! help?!?

My girlfriend has just broken up with me, she bluntly told me that she does not feel the same way anymore about me like she used to and it's best if we do not date anymore; she said that the spark is gone which is something I don't get because until a week before christmas we were fine but after that I realized she was acting a little bit distant. She swears to me that there isn't another guy. I have always treated her well so I don't know why she's apparently fallen out of love with me. I've always been a loner, I don't have friends, she was like my only friend and now that she's left me I don't know what to do, my whole time was simply filled by spending time with her, and only her , no one else. and now I won't have anyone to hang out with anymore. I don't know what to do. I never saw this happening I thought i'd marry her. Is it possible to make that person fall in love with you again if she doesn't not like you anymore. please help me guys! I hate being alone.