If you’d be willing to put yourself in harms way for another person, you love them. By harm I don’t necessarily mean dying, harm could mean even a risk of an injury or something.

Just to be clear, love doesn’t necessarily mean romantic love, it can be love for a family member, a friend, or even just society in general.

I’d jump in front of a car to protect my wife and kids, but probably not my dad. He’d be okay with that since he’d be the one jumping in front of the car to protect me. If he calls me up and asks me to help him install something on top of his house (he has a history of falling off ladders) I’d go do that for him though.