Love can be defined as an unconditional feeling that makes you happy as well as sad. Love can cause many emotions at different times. There are different types of love that exist, like the love between a parent to a child, love between people of opposite sex who are attracted to each other, love between a brother and sister and love between a person to his/her country.
baby don't hurt me! dont hurt me no more!.. sorry had to say it haha. but to answer your question I think the other person covered it, but love is hard to explain, it can mean something different to different people. some people may love pizza, but some may only love close family members and friends.
When he is in the same building, you know you are safe, happy cause he's there, ecstatic when you see him and he smiles and waves at you and calls out your name in greeting and just you know warm and hmmm inside.