Breakup, ha ha ha, official breakup, wao.
Which breakup are you talking about. Forget not your relationship was not based on any commitment , it was a pact, you did not loved that girl , you pity her to stay with her , so why are you crying now ?
She tried to called you and you ignored her so why crying now ?
Again someone else is screwing her so why crying now ?
And how come the guy Raveesh is a bastard, infact he is doing a great job , he is supportive to the girl when she needed you the most , and he is doing the job for you , you need to be thankful to him and you are treating him with all sort of names.
Infact am not used to taunt people but the above was necessary to show you the real picture.
Previously I had told you being at your place I would not have let the girl go, and also told you its always better marry a girl who loves you and not one whom you love.
Anyway what happened happens for good [ better for her , and sorry for you ].
You are already her past so forget her and start afresh your life whatever she is doing is no more your concern, find a girlfriend for you concentrate on your studies and career , start yoga , do some sport activities, join some gym , do meditation.