It's hard to comment since there has got to be a great deal of back story we haven't heard. However, you did say you don't love her anymore. I think if you're done as a couple then you are not being selfish... you are being single.

Good luck!

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Put me on wheels and I'll turn tricks.

Clever? Nah, I ran out of that years ago. But if you find this, let me know, k?
"The road goes ever on..." ~ Tolkien

In memory of my friend skip...
Go then, there are other worlds than these