don't worry. You'll see them again. ;)
MC isn't the only transmigrator. So far there is the ML and one other and none of them come from the same origin world.
Not all of the exes have been lovers to the MC though all of them have had s** with him.
The system is Straight for one, which comes in a little conflict with the MCs interests making their interactions a little funny at times and above all feel fresh. It must be said that he doesn't come off at all as a homophobe. He also seems to like lolies though at this point not much more can be said. He's intelligent in terms of calculations offering his services on this front and occasionally noticing aspects of MCs lovers that MC has overlooked.
the returning into the futuristic society with the typical Chinese internet gossip and slandering scandals with the inevitable 'face-slapping' afterwards