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Might the story be in here? I know there's a similar one, so I hope this is what you are looking for. If not, it's a good read.
http://www.mangago.zone/read-manga/sore_wo_ittara_oshimai_yo/
I don't remember the name, but I'm sure I read it on myreadingmanga and found it here a long time ago. The plot (This is not 100% accurate): An inventor recreates his lover into an android, but even though the inventor takes him in he is very cold to the Android lover. But still the android cares for the inventor, so he tries to find out what happened to the original lover, the one he is copied after, that made him die/made the inventor hate him so much. The ending reveals that the inventor is actually an android himself that was created by the original lover when the original inventor had died. But because the original lover couldn't handle the loss and the fact the android inventor wasn't the original he drowned himself in the ocean. And to get revenge for leaving him behind the android inventor creates an android version of the lover. In the end, the two androids fall in love with each other and it's a happy ending.
If anyone can find this manga, that would be amazing!