Should I break up with her now or when she gets back from her vacation?

We have a good relationship and I care about her very much but we don’t want the same things for our futures and we argue fairly often. We’ve been together just under a year and I feel I need to end things but I’ve felt too guilty to do it because she’s very loving and kind… now she’s leaving to see family for 2 months and I’m not sure if I should end our relationship before or after her trip. I don’t want to ruin the trip for her by breaking up now but I feel like waiting so long is stressing me out a lot so I don’t know what to do.

Should I break up with her now or when she gets back from her vacation?
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