Unrequited or confused love?

So I told this guy I'm in love with him. For reference we've known each other a little over a year. I'm 26 & he's 9 years older then me. After I confessed my love for him he told me that i was crazy basically but continues talking to me; dropping by my apartment etc to hang out. We talk like friends,I try to keep it cool & cordial so I asked his advice on a guy situation I was having & in some words he basically told me to stop messing with this other guy (that he was grossed out cuz the guys a giant manwhore etc) & said he's not comfortable having sex with me if ima be sleeping with someone else. So he basically volunteered to be my new fwb. He seems to always come to me when he's seeking peace and understand even though we both admit we're nothing alike & always butt heads. I had accepted the fact that my love towards him wasn't reciprocated but his jealously confuses me. Someone please explain