How do I get over a girl I fell in love with who use me as a rebound?

Long story short started a new job a while back and crushed hard on a girl but she had a boyfriend. She broke up with her boyfriend then we started texting and hanging out everyday for 2 months. Started to fall in love, like i have never had a feeling about another woman ever like i do with her. Turns out i was a rebound. No matter what i do or any other girl i'm with i can't get over her. Then i saw her with the new guy and i almost snapped and broke his jaw (He is a jobless broke scumbag loser). The thing is i see her everyday Monday through Friday. Also i can't quit because its an actual career not a department store or whatever job. Plus i dont want to because i really enjoy working there. Any advice?
Updates:
+1 y
oh and it was a bad break up. She hates me now
How do I get over a girl I fell in love with who use me as a rebound?
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