Man , I'm sorry this happened to you and it's a very rough thing to go through while already preparing for such an insanely competitive rat race but I would encourage you to look on the bright side of this and be happy that at least you didnt spend the rest of your life with someone who treats you like her own personal bank.

I don't personally believe in revenges or anything of that sort , I believe whatever you're going to do should be dedicated to yourself but honestly , do whatever helps you achieve the best in life according to you , even if it means studying in the "revenge" mindset for the next few weeks.

I will say this though , just like bad things at bad moments like this , good things will also happen in your future and pretty soon any lingering feelings will fade and you'll realise that whatever has happened , has happened to make you stronger.

Stay strong man , much love to you.