how to sue someone u loved?

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i was liking a guy,we were best of frnds,it gradually changed to love,he too was giving +ve vibes but later we fought big time that it cost me his frndship too!i paid a big prize.blunder was done by both,i apologised like hell but he never respected my frndship too.now when i see him or even think of him,my blood starts boiling.my question is what is the best way to take revenge against someone u loved?