For a potential LTR upgrade I plan on saying "I dont date girls who keep in touch with exes" or "When in a relationship I dont message my exes/flings and I expect the same" or "My GF doesnt keep in contact with exes, you cna do what you please but my GF doesnt"

On one hand its a personal boundary because I cant stand to know/meet any LTRs exes. On the other most women think its normal to stay in touch with an ex.