I went on a very belated honeymoon with my husband of 5 years, 3 months later we had split
I went to new york with my next serious boyfriend, 10 days later we split.
My current partner and i went on a weeks holiday together after 3 months of seeing each other and came back pregnant, we now have a toddler and look forward to our holidays as a family.
Every relationship is different, if its gonna fail then a holiday isnt going to effect it in any way :)