I know how you feel. At least the part of not feeling the relationship any more. I've recently ended or trying to end my relationship, so a lot of your thought process has probably passed through my brain as well
The bottom line is, you cannot not hurt her. You will hurt her if you stay in the relationship as disinterested as you are and you will hurt her if you leave. BUT, you should really do what is right for you. F.L.Y. - first love yourself. It may sound selfish, but it isn't. You have to take care of yourself and your joy for life. I can promise you one thing, she will be ok and eventually happy again, and so will you. People cross paths, share, learn from each other and grow together. Sometimes, usually, this comes to an end and it's time to part. It's not the end of the world. The only thing you can do is be sensitive and compassionate in the way you break up with her. Don't make it about her, or about the relationship, but point out that you need this for yourself. Don't use the word break up, suggest a pause, as you already did. Tell her you really need to focus on yourself and you feel bad about not giving her all the things you want to give her, emotionally, time-wise etc. Ask her to give you some time to sort your own emotional well being. Who knows, you might find out you still want to be with her, but If you don't, it's much easier to break up once you've gone on pause, than directly. I hope this helps, although I suspect you didn't wanna hear this.
When people try to force love, it usually doesn't end well and just prolongs the suffering. You know the saying: love is like farting, if you have to force it, it's probably shit
CHAT
God, I've missed this place