And I'm sure the fact the Ant is not depicted in flashbacks of the Teen Titans or as a member in the modern day is in no way an indicator of anything happening to him later, like going into villainy full-time.
(Poor bugger doesn't even have a Wikipedia entry. He's just got a footnote.)

Eh, oh well. Probably for the best.
Insect-based superheroes. Pfft. Like that would ever catch on.