Vacation booked with ex. What would you do?

My ex broke up with me a month ago. We have a booked and paid non refundable cruise to the Bahamas in 3 weeks. I came to her saying I still wanted to go, and would prefer not to flush $750 down the drain. She was originally invited by her friend and her friends bf, and then she invited me. Her friends have a 6 year old as well. She told me she would just stay back and let me go by myself, but later walked that back and said she couldn’t let down her friend and that it would be inappropriate if I went. I was never going to just go in her place. She told me she wishes it was refundable and she is “sorry”. She doesn’t want to talk about it anymore. I didn’t like that she basically told me how it was going to go without discussing it further. We are booked in the same room, but I told her we can be civil and she also has her friends there which I imagine she could stay with them in their separate room if she needs to.

Today she paid the $150 fee to take me off the booking. Although, I have just as much control over the cruise booking as she does, and I could add myself back if I choose for $100. She refuses to compensate me in any way if I don’t go. I have already taken a week off work for this, and I haven’t been on vacation for 6 years. I have no intention of getting back with my ex, but it rubs me the wrong way with how she is handling it, and I could use this vacation, but I’m not sure what choice to make and how I will feel about my self looking back on it when all this is over with. Not even sure if I want to go or not.

Do you think it’s a bad idea to go? How would you handle it? AITAH?