How to know if someone in love with you?

When they really give a fuck at anything you do. Like they’ll get mad at you if you do something stupid. They’ll do anything to make you happy and never ever make you feel like you are a burden to them. They care about your job, your family, foods that you eat when you are stressed out, they care about anything as long as it is associated with you.
They’re not in love with you if they don’t care at what you do.