<human>: So a little back story: We have been together for a bit more than two years, and we have had a really good relationship, up until now. Lately I feel like we have lost the "spark", like something's missing. It started out a bit more than a month ago, at first I tried to ignore the feeling, and tried to fix it, but it has just grown stronger and stronger and I can no longer ignore it.

I told her how I feel a week ago, and I was very close to ending it, but she convinced me to stay and keep on trying to make things better for a while, now that she knows how I feel.

Don't get me wrong, I care about her really much and she is still my best friend in the world. I would very much like to be with her, I just don't feel like I can.

Her self esteem is quite low, and she is a bit introverted, so I feel like shit for having these thougts, knowing that I will be the one who keeps all the friends, leaving her completely alone, if I dump her. I don't want to make her depression worse again, now that it's gotten a lot better. I feel like I'm all she's got.

Am I just being selfish if I end it? Is a week a fair amount of time given to fix things, if I still feel the same? Is a breakup over the phone acceptable, if you know that the person will refuse to let go?

Can you give me the gist of the text in a nutshell?
<bot>: I feel like our relationship haslost it's "spark" and that it doesn't work anymore, she does not feel the same. I have tried fixing it for more than a month. What should I do?