People also readily undervalue things that come to them easily - relationships, friendships, money, power, etc. I work at a multi billion dollar facility that is routinely taken for granted by workers. “Oh it’s just this place” sort of thing. I’ve known men and women to undervalue relationships that came to them easily. That exact concept was on display in Hemingway’s The Sun Also Rises. I think the “struggle” really does make people value things and others more highly and the lack thereof less.

My working hypothesis is our brains are always learning - literally everything. We learn our concept of time from our experience with it. We learn our concept of a relationship with another person from our experience with them. If someone comes into our life easily - relative to other relationships - our brain associates them with less value. It’s also horrible logic.

Edit- as for whether someone likes you: people accept, overlook, and tolerate more aberrations from normal/good treatment from people they value or like. If they’ll accept little of your aberrations then they’re unlikely to ever like you - run for the hills. That’s one of my tricks for likeness.