"Don't forget me."
"My apologies, but I already have." -- Anon Guest
Synthetic emotions are a tricky thing for AI's. Some, like those created by the Consortium of Steam, feel deeply and without many complications. Others despise emotion and suppress it whenever it creeps into their experiences. Between those two extremes are those who have emotions, and are devastated by them when they are negative.
Their coping strategies for this are not always socially acceptable amongst organics. One of the more common methods is erasing all memory banks of things that could cause such upset.
Thus, when R0B-3 bade Human Stef farewell, it got... awkward. The former Ships' Human wrapped his arms around R0B-3's malleable silicon exterior and said, "Don't forget about me," just as R0B-3 erased all memory of Human Stef.