He knows I like him which is why he stares and smiles?

This is my friends brother (he might know i like him) - Always come by me and talks when i am at the house - Stays by me/talks even when my friend isn't by us - Asks me a lot of questions about myself - Remembers random details of things that i said/happened long ago - Smiles a lot while i talk to him - Looks right into my eyes when we talk - Stares at me often & holds the gaze even after i catch him looking - Offers me his jacket when i was cold a few times - Doesn't straight up say anything flirty though Likes me? or just is nice-feels bad because he knows i like him.