<human>: Can you provide a brief rundown of the text in within 3 sentences?

I'm in a great relationship right now, the best one I was ever in to be honest, my girl is awesome, sweet and caring but there is a big problem.

I feel like I stopped loving her, my heart just doesn't race when I see her like it did before (I've had this happen rarely tho because after I broke with the girl I was in a long term relationship with I felt like I don't have feelings for anyone and I never felt my heart beating like crazy or actually "felt" love anymore).

When I try to think about my life without her it makes me sad, not having her every night by myself, not seeing her smile when she sees me, not feeling her soft skin.. All those thoughts make me feel horrible but I don't know what to do. She loves me very much and I'm the only person in her life she can trust and put her hopes into, her father passed away when she was very young and her mother treats her like crap. She told me a million times that she doesn't know if she'd still be alive if she didn't meet me, that I'm the only person that's keeping her head clear and I'm the only reason why she keeps going every day.

I don't want to break her heart, I love her in a very weird way but I don't think I can be in this relationship for a long time. The thought of breaking up with her is killing me but the thing about "not feeling it" is also killing me.
It's not like I don't love her, I can't imagine my life without her but I feel like it's just not right, I go through every day just to make her happy, to give her everything she needs, I'm giving her everything I can give her and I'm not asking for anything back because I care about her so much.

How can I fall in love with her again? How will my heart ever race when I see her? I've spent a lot of sleepless nights with a pillow filled with tears (from the thought of not having her in my life) and I still feel like I don't love her but I do. On my own way.
<bot>: I feel like I don't love my girlfriend anymore but I still do, don't want to break up with her because it would kill her, need advice on how to fall in love with her again.