Do you think it's really worth it?

I think doing charitable work should not have anything to do with your relationship. Try to remember that this isn't about you or her it's about what you two can accomplish. Relationships are hard, break ups are harder but that's life and all you can do is keep on trucking. It'll get easier. Even though you are hurting now there's no reason you can't suck it up and be the bigger person. Try to approach your feelings towards her the same way you approach your charitable work. It's hard and sometimes it's a sacrifice but it's worth it in the end oh and btw it doesn't matter who raises the most money it should be a contest. remember, it's about the bigger picture.