<human>: Hey reddit,

I started dating this girl 6 months ago, went into it thinking long term, not random hook up or anything of that sorts. She is my first girlfriend and I am her first boyfriend (I turned down all offers from girls before due to not being interested in them or having no feelings towards them; she went on dates but never did anything beyond that (had no feelings towards them)). 

We have a great time together, I don't get tired of her/vice versa and we have great chemistry. I know I love her and I know it is mutual. We are honest with each other and I have no problems with her character or any of her behaviours, except for one.   

One thing to note, she considers herself as an introvert and is scared to get hurt emotionally. Anyways, once in a while (approximately every fortnight), she gets scared of me leaving her for someone better (her words) or me stop loving her (her words). I never asked a girl on a date before but I chased after this girl. Tried to initiate contact, etc. however lately I believe it is 50/50 from both of us in terms of commitment. She is not upset with me nor I think I don't do anything to wrong her. She just gets scared that I will leave her in future and wants to break up with me before she gets too invested into our relationship.

We have a (stupid) fight about it but next day it seems to be fine, both apologize and we get over it. However, each time she does it, it hurts me a lot and it just ruins my day. I don't understand where she gets the feeling of me possibly breaking up with her in future and leaving her for someone else. She thinks that her introvertedness/character (always turns down my offer to go hang out with my friends) will push me away (And I have no problem with her being wanting to be alone with me). She is not insecure with me hanging out with other girls neither I am.  

How do I deal with it?

Provide a brief overview of the text.
<bot>: GF wants to leave me because she gets scared that I will leave her. I am also tired so my apologies for incoherent sentences or grammatical mistakes.