I want to go to europe alone instead of bringing my ex even though we planned to go together.
What is your reason for wanting to go alone?
I was hoping to head home and spend time with my parents.
It makes sense that you would want to go to Europe alone instead of with your ex, even thought you made the plans together. You shouldn't be expected to go on vacation with your ex, because that would be very awkward. I think you should just go to Europe alone.
I hate you.
Do not feel about about canceling plans with an ex. It is expected that there will be some plans that need to be canceled after a breakup anyway. It is no worries!