If your bot was left "on" at the time, it would have become an NPC that disintegrated when it got reset. You can respawn the bot by shift-clicking the empty base.
My romance "cool down" as soon as they reach permaplat. Most of my romance sims never had more than three to five lovers in their whole life - but kept them for as long as they live, either as legitimate partner, lover or best friend. Better story material than the"who's next" maxis style....
My first 20 whoohooer fell in love with all the 20 different girls... he was servo, so could not use the lovetub, and never made it in public. Only 5 girls are still his friends. The other 15 take turn kicking the trashbin, when the gard bot is broken His worst day was a downtown date where he met no less than 5 of his lovers -and miss Crumplebottom. But he had the girl anyway Servo have a solidly attached head...