<human>: For a little while now I've been struggling to myself about whether or not to end it with my gf. I thought it might be fixable but the fixable problems don't matter nearly as much as the ones that I don't think can be fixed. I know I want to break up with her, she thinks we're going to get married one day, have kids, move somewhere nice, the works. I don't see that happening anymore, so I need to end it. 

Her birthday is in two weeks and I promised her a daytrip. I don't want her to have a depressing birthday alone, she doesn't really seem to have a lot of friends and I know how bad she wants this daytrip, but I don't want her to look back thinking I was faking my way through it with her. I still enjoy being with her so I'm sure I could have a good time but it just feels dishonest.

The longer I wait the closer it gets to her birthday the harder it's going to be for me to do this, I don't wanna taint her birthday with a memory of a break up. If I do the daytrip how long after should I wait to do it, it seems just as bad to break up a week after vs a week before. I care about her but I don't want to wait a month+ and then break up, then live there for two weeks while I move out, etc.

Summarize the given text in a few sentences.
<bot>: I have decided to break up with my girlfriend. Her birthday is coming up, do I break up before it or after?