<human>: Give me the gist of the text in a nutshell

My girlfriend last night has confessed to me that she has fallen in love with me. I told her that right now I do not feel the same way. While she did appreciate my honesty of my feelings, this was essentially one of her biggest fears coming to fruition. She has told me on multiple occasions that one of her biggest fears is that I will not able to fall in love with her and decide to walk out on her. This is my first serious girlfriend and I'm not one to just run around with other women, I want to settle down forever if I could. I truly do like this girl and want to be with her forever but I'm so fucking afraid that I will never fall in love with her and will ruin both of our lives.

A little background to our relationship is that she left her boyfriend of 4 years to be with me. We had been spending more and more time together and eventually one day feelings were confessed on both of our ends. The next day, she packed up, left, and moved back to her parents and we've been together since. 

Another things that hurts the situation is my GF coming to the realization that I had fallen in love with a girl awhile back. Nothing happened with me and the other girl but it's sort of like "I could fall in love her but I can't fall in love with you." This makes her extremely jealous and upset to the point of breaking down. 

I'm so scared of never falling in love with this girl because right now she means the world to me and I don't want to lose her. I told her that I want to stay together with her and make things work out but now we have this in the backs of our minds. I guess my concern is the ability to fall in love and whether or not I'll be able to have the same feelings for her that she does for me.
<bot>: She said she loved me, I told her that I didn't. I'm scared of not being able to fall in love with her and losing her. What do?