<human>: Can you provide a brief overview of the text?

My girlfriend (18f) and I (17m) have been dating for a couple of weeks now. She asked me out about a week after I stumbled out of a rather stressful relationship. 

Yesterday she told me she loved me. 
I really don't know how to respond to this, because I'm scared to shit by the word love. I'd been in several other relationships where my girlfriend told me they loved me way too early on, and as a result the relationship just burns to ashes because its going too quick. It is due to this that I have tried to not go too fast with my relationships, because its just easier on both ends. I also believe love is a duty rather than an emotion. Its not "I like you so much that I love you", its more like "I am so devoted to you that no matter what happens, ever, I'm never going to go to sleep being mad at you". She says she feels like she's known me forever, but I think the relationship is going dangerously fast.

 Question- *Should I say that I'm not ready to love someone like that and move on like it never happened, go along with it to avoid hurting feelings, or tell her I'm not ready for a relationship like this and end it before it ends painfully?
<bot>: ? My gf told me she loved me, but I think the relationship is going too fast. What do I do?