What should I do?

So I’m friends with this dude and we’ve been friends for like 2 years now and we’ve become ig fwb and I’d send him pics and stuff like that. He had a girlfriend and was still asking for booty pics so I sent them then eventually I got tired of being a side hoe and I told him i was going to stop sending and then he stopped talking to me for a whole 2 months. Which really sucked cause I missed having him as a friend. Then we’re talking again and hes been asking for pictures so I’ve been sending them. He asked me to do something last night and I politely said no. This morning he completely blew me off and in the back of my head I was thinking he’s not going to talk to me anymore but later that day he saw me and gave me a hug so idk. I feel like in order to keep being friends with him I have to send pics. It’s would hurt sooo much to lose him as a friend. What should I do?