Hahaha...."Mohammed Ali with a car" As for the grocery shopping stuff.....is there only one store in your town? If not,then you might tell ex that you would appreciate it if they shop at the other grocery store. Or you just might practice your spitting skills so you can walk by her head held high then hock a loogie into her hair (ok, not appropriate I know but we can dream right?) Just remember if an encounter happens, YOU have no reason to hang your head in shame.
Hmmm....perhaps if you meet her, just shake your head and say "you poor thing" lol. After all, what's she got but a guy who is a cheater and stepkids who will never accept her.