It might sound strange, but it would be, "Don't get married."
To explain, I'd still plan on being with MrsTasty, she just wouldn't be MrsTasty, she'd be MsWhateverSheWanted. We'd be like Goldie Hawn and Kurt Russell.
Circumstances dictated that we married when we did, and I think both of us feel like we never really made the decision for ourselves, that it was made for us, to a certain extent, so it's one of those "just on principle" things.
Yes, one of mine would be "don't fall in love and then, eventually, get married."
Although that isn't strictly true, I've been very happy with my life in general. Mostly happy marriage, children, grandchildren, good lifestyle and promises of more yet to come.
It's more of a 'what if' scenario.
As I've mentioned before here I was very heavily involved in amateur archaeology here and was looking to make it a career. I was used as the Site Supervisor which meant that I took instructions from the site Director and it was my job to boss the 'troops' around and ensure the excavation went smoothly and scientifically.
While doing this we were visited by an English archaeologist who was working in France. He was impressed with what he saw of me and he wanted me to move to France and work on a site near Rennes that he was about to excavate. Instead of speaking to me directly he (quite properly) spoke to the site director. He never passed on the job offer as, in his words, he didn't want to lose me. He did pass it on eventually as he felt guilty, but it was far too late by then.
Emboldened by this I started applying at universities to see if I could enrol to do an archaeology degree. This looked very promising then one day I met Mrs Wyshiepoo. Within a month I'd got her up the duff and we were making family type plans.
This meant for me a much more conventional career path, and that paid off as with the job I'm in we are much more secure financially than if I'd been an archaeologist.
But still, sometimes in an idle moment I think 'what if...'