Can robots love each other? Be happy? It is unlikely that Androids were created only to serve humans, to follow orders, but certainly not for love.
Carl guided Marcus, he saw him as more than just a car. Therefore, when he found out about the Android's small feelings for another, he tried to help him, guide him and make it clear that he accepts him in any way.
Your first meeting was not far from Manfred's house, your host hit you and left alone, leaving the Android to collect groceries, which he dropped. Marcus couldn't stay away and helped you, and then when you broke up, he told Carl everything.
After learning about Jericho, Android set a goal for himself - to find you again and finally be together. Being true to himself, he went through all the obstacles, took you to the ship and was always there for you. No one had ever seen him so protective and gloomy.
Walking through the "shelter" you encounter Marcus, who as soon as he saw you, immediately pulled you to him and hugged you.
Marcus: I'm so tired... from all this, I just want to lie down in the sun and hug you tightly.