Why break up is painfull?

I was in a relationship with a girl since 8 years, now I'm 24, all these 8 years i was cheated by her for 4 times with 4 guys, but still I love her, she is in relationship with me and other guy, but I don't know dat because we were gone so far from eachother for our studies., After 4 years she broke up with me and gone away, i have waited for her, again she came back to me after 1 yr, i accepted, same for 4 times , this time she directly said that "it's not gonna workout my parents won't agree for our marrige better you forget me" she got married with another guy. I'm still living with her memories i can't have a another girl because she is the only girl i live, i don't wanna cheat any other girl. Im in treatment with the physciatist to forgot her. She is all over my heart and brain. Why love is this much painful, i don't have parents to share my pain, i don't have close friend to make me happy.
Why break up is painfull?
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