legal advice needed what can i do about this girl she is mad?

there is this girl who was my friend, she used to flirt with me so i also flirted a little just for not looking rude......then we were one day watching a movie and she kissed me....kissing her was last thing in my mind but as she kissed me i in that action kissed her back, i lost my sense so i also fondled her a little but no sex then or later. The thing is that i didn't liked her in that way so after that i started to maintain distance from her, she is saying she loves me but i said i don't and i also told her that evening i lost my sense after she started that all and it was not my will.

Now the problem is that she is threatening me of committing suicide if i don't love her back, she also may write letter with my name on it before dying what must i do?