mettaton and alphys are literally like. alphys thinks mettaton doesn't care about her anymore but he was 100% down to drop everything to help her carry out an elaborate facade involving complex puzzles and traps, memorizing lines, setting up whole sets, and planning a ton of stuff ahead of time just to make a human like her. he did it AND helped her with her lines even though he CLEARLY found it boring and it lost him viewers. he gave her a poster when he premiered on tv and wrote "thank you for making my dreams come true" on the flap. she hung it on her wall and never took it down. even when she was watching him die she never revealed his old identity. in return he never told a soul about the amalgamates even though he was horrified by the whole situation and resented alphys for it. a secret for a secret. they don't talk anymore. they know more about each other than maybe anyone. he teases her about her crushes with a surprise question on the quiz show she asked him to make. just to fluster her. she tells him about her crushes. she tells him so many things. he doesn't need to tell her anything. she already knows. he thinks she's a liar and a coward and utterly pathetic. he has been lying his whole life. everyone he loves is pathetic. she invites him over to undyne's house with her. she made his dreams come true. he made her dreams come true.