Most Helpful Guy
Well, that's like a mystery. He means to say he does love you but not to the same level like how you love him.1
Most Helpful Girl
It can mean different things. You should ask him to explain what he means
It can mean he genuinely loves you , but can't be with you. It takes more than love to be happy in a relationship. Or he could mean he loves you , but isn't " in love " with you.
Personally I'd ask him, instead of second guessing what he actually means