Ask Ton: Help I'm Scared Of My Girlfriend

We met last October . She helped me with a project and since then we got talking. I really liked her because of her nice qualities. So it happened that we started dating.
Now the problem is she is just too good to be true. I really don't know how to put this, but she's overly concerned about my well-being. All of a sudden she is just too nice and I'm somehow scared now. Whenever there is a misunderstanding, she will begin to apologize and start crying even though I'm the one at fault. That is just one.
Whenever she texts me and I don't reply, she will call. If I fail to answer her call, she will start coming over. When I ask her why she is so bothered, she will say she thought something has happened.
Recently, I no longer have my space. She is always around. She always want to be there when I hang out with friends. She doesn't even give me any chance to miss her. Now it seems I'm getting tired of her.
She doesn't let me do anything for her when I try to. Now it is as If I'm the babe.
Recently she jokingly told me that if she sees me with another lady she will poison me and she will kill herself. She wasn't looking serious but I became scared.
Now we have not even dated for more than 4 months and she has started talking of settling down.
I do not know if this is love or obsession. Because this is not the kind of love I asked God for.