My previous girl friend keeps on mailing me. What to do?

I am from India and I had a relationship with a girl for an year. I was not so involved because our religion are different. But she was so possessive and obsessive about me that she made this official to everyone of her friends and her family without informing me.

I liked her, but my parents are so conservative and it didn't work out. Hence I ended the relationship about an year ago.

After this, she used to call me and message me countless number of times for 4-5 months continuously and I didn't respond. It was a very difficult period for me as my phone kept on ringing all day long throughout these months. Initially there were a few suicide threats also. Thankfully, it didn't happen.

She got a job and all during the time. After this 4-5 months of constant texting, mailing and phone calls one day she stopped messaging. I wish so much that she should forget me and move on. When she stopped calling me, I was happy and thought that she was moving on.

I am not in any relationship whatsoever and I intend to marry a girl as per my parents' wishes.

But after a 6 month gap, she has again started to message me. Not very frequently, but twice or thrice a week. She says she is missing me and all. I don't want to keep any contact with her. But I am worried if she will kill herself or something like that because she used to threaten me with suicide during the initial periods of breakup. It was frightening for me. I don't know what to do just because I fear if she will commit suicide. My parents are currently very eager and happy to find a girl for me and this is what I want too. She is now 26 and I don't really know what's going on with her.