Did Future Odo really genocide a planet because he couldn't find a girlfriend in 200 years?

Just rewatched Children of Time, great episode, but what struck me this time around was that Future Odo must have been really unhappy there to unalive (this feels like the most accurate word for it) 8,000 people who he had been living with for 200 years.

Did he not have another girlfriend? He wasn't even together with Kira at the time of the crash and just a few episodes earlier he fell in love with that under cover cop. So it's not like his heart was only for Kira.

Also, Kira would have died of old age by this point in Odo's life anyway.

Who here would genocide a planet to save the life of your first crush who you were too chicken to ask out?