How much should i contribute to our Disney trip?

[Paulagrace]

Im going on a disney trip that i got talked into with my girlfriend and her 2 kids. The cost for room and flight is $2000, How much should i put in for my part. She doesn't want to tell me how much to give her. She makes a little more than i do for income. Plus i have some things going on right now and money is tight. She made the travel arrangements and we all have disney year passes already. Thanks