You dated her for a year. She fully understands who you are and doesnt want to be in a relationship with you.
Stop being dramatic about this because at this point none of us give a fvck if you go on this cruise with her or not. 7 pages of you not making a decision? Come on bro.
Just tell her you are not feeling it and you arent going. You dont have to give her any further information. She said she wanted to take a break and dumped you. Stop being a beta cuck and end this already.
As soon as you get back from this cruise with her, she will dump you again. The only way that you will gain any self esteem and value is if you just tell her that you're not feeling it and back out and then delete her number and go find someone worth your time.
This is like 7th grade drama.