Tell every man you are getting serious with you want fresh flowers at ALL times. It's the best early vetting method of a LVM.

Flowers are $30 for an expensive set and take a 5 minute detour on the way home from work every 10 days. If you're getting serious with a man, tell him you love having fresh flowers, if he's worth anything, he'll listen without you telling him and make sure you always have flowers.

Ladies, this is the bare minimum, if he can't put in the effort of flowers, he's worthless and shouldn't even deserve a “goodbye”. Block him and never give him closure.