Get Your Friend/Girl-Friend Back?

Am a 3rd year college student. This girl I was with 7 months , I proposed. her and I knew she would say yes but then her roomate told her not to date me Cauz Then our friendship will get spoiled. Suddenly her crush messages her , and after sometime they get into a relationship. It's been 1.5 years , and I have that incompleteness type feeling in me towards her. I will do anything it takes from working on myself day and night to have something her one day. Just suggest me guys and girls , how to get her back.
PS: She doesn't even know why she likes her boyfriend, and am pretty sure am way better than her boyfriend in every aspect.
Get Your Friend/Girl-Friend Back?
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