Looking for a manga where the parents of the MC decided to put him into cryogenic sleep until they could figure out how to cure his disease? but in that time his bf died (i think) and was replaced by an android version, in the end the android goes off in the desert somewhere and the MC goes looking for him, something something about robots learning about feelings. It was really cute, would love to read it again.

Is it 500-Nen no Itonami?

Yes, that's it! Thank you!