I don't get why it has to be more lifelike. If you have a char be in love with someone in 7 out of 8 routes (6 chars, Vexx and No romance ) then that's canon. Your MC's romance just starts feeling more like headcanon, not sure I'm explaining it right. I don't like side romances with love interests, feels like MC is breaking them apart.
Also, it's one thing to have things develop with people you're not romancing in one route, and another to have different backgrounds depending on your choice. Like in Damon's route, if you're romancing him, he's just friends with Alisa and the past is past but if you aren't romancing him he is totally in love with her. Background should stay consistent between routes, I think.