Any modern setting stories where the wife/gf gets revenge on a cheater?

You might like this one
https://www.mangago.me/read-manga/until_i_get_rid_of_the_husband_who_watches_me/

Short, sweet, & satisfying (3 chaps):
https://www.mangago.me/read-manga/how_to_get_rid_of_a_husband/
Longer, more fleshed out, & worthwhile (71 chaps):
https://www.mangago.me/read-manga/revenge_is_ours/

Here you go, enjoy darling!

Excellent