Well they worked together every day for another 18 months after that, and as far as can be ascertained they are still on friendly terms, so I doubt it would really be an issue.
Yeah, remember, they had already broken up by the time they became an on-screen couple.
Having said that, it should be Trish Stratus. I mentioned this in a BR article this week, but remember: They feuded or teamed off and on for pretty much their entire WWE careers. Their first big PPV match was against each other (Fully Loaded intergender trios match in 2000), they were partners for the "She's All That" knockoff story and the tag against Christian and Jericho, they main evented Raw against each other in a famous match, Lita was Trish's retirement match opponent, etc.