Boy problems!!

I have been talking to a 15 year old boy and I'm 14 however he is in year 11 as I'm year 9, we have been talking for 6months coming up and we are Fwb but however act like a couple. He is embarrassed to admit it to his friends and tells his friends he hates me and I'm a slut and he likes nudes etc, 2 days ago we face timed and he said can I have a picture (nude) and I said sorry I'm not a nude person anymore and he was like please stays between us etc and I said no and since then he has been off with me? I love him tho more than anything in the world I don't even know why, he is  my everything and he doesn't understand, he slags me off to his mates and tells me he loves me when he doesn't he hasn't met me in like 4 months and I rang him yesterday because I told him I wanted to talk however his sister was there and she knows about us and as other people were there I was like oh it doesn't matter I will FaceTime you tonight and he said I can't got work till 4am when his work starts at 6 ends at 10pm so he is lying, I cried so much yesterday also I gave up so I blocked him? right idea???