A girl from my college broke up her 4-years long distance relationship to be with me but went back to him again after 2 months?

So basically she was my crush in college, on farewell day i talked to her, we took pictures together, afterwards she texted me and asked for the pics. Then she showed high interest in me and also said that she broke up.
We had a good relationship going for 2 months but now she went back to him and left me attached to her. What do i do in these situations?

A girl from my college broke up her 4-years long distance relationship to be with me but went back to him again after 2 months?
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