I 17F in the friend zone with 18M, am I insane for staying when I’m basically a rebound?

Hi So I’m a 17F and I have a friend who is 18M, we began being friends three weeks ago and he had just broken up with his ex girlfriend which I did not know about. Anyway we began talking and on weekends we call for like more than 5 hours just chilling and talking, and we call a lot and we text so much we like never leave eachother on read or delivered besides from saying good night and good morning texts which is what we do. Anyway, we also are friends with benefits and we sext.

The other day we called and he has to go which was fine but i decided to check up on him and he said “you know we are just friends right” and then deleted chat but i saw it and it hurt like a motherfucker because I realised I caught feelings and he didn’t. Later that day on call, I told him how I felt and he said that the chance of him catching feelings are bigger than I think but he hasn’t caught them but I was shocked about bc the things we do our more for couples. He always talks about his ex most of his problems are centred around her which is totally understandable bc they just broke up and they are still in contact. He says I’m the best person he speaks to at the moment but I’m not sure. I literally think about him all day and dream about him and I miss him all the time like I really like being in his presence. And when I asked him he said the thinks about me at night. We even fell asleep on call together. I made a pros and cons list on him .

My conscience and the people around me are telling me to block him because he will become an unnecessary distraction, especially since I’m doing a levels and I’m in year 12. But my heart doesn’t want to at all and is clinging on to him like koala. I have cried already last night and it’s so bad that I’m looking forward to our call tomorrow. I’m so fucked.

TL:DR – I think I have fallen in love with a douche bag, and I don’t know what to do. And I’m in the friend zone and shud I just leave or be patient.