Am I the Asshole for Refusing to Let My Situationship Touch Me Inappropriately?

So, I (24 F) and this guy, let's call him K (25 M), have been friends for 10 years. We were pretty good friends—we chatted, shared personal things, and supported each other through life. However, I started noticing a change in K's attitude toward me. He became more flirtatious, complimented me often, and generally started acting like a boyfriend. My best friend had told me that he'd liked me for a while but was playing it safe, and now he was trying to make me fall for him. I didn't mind because he was a good guy who treated me with respect, was funny, and was relatable. We started going on dates, and on these dates, we talked more about our future together. This is where things went wrong. K, to my shock, was quite close-minded and conservative, which was the total opposite of me. This difference led me to tell him that it would be better for us to stay as friends, and if he didn't want that, we could go our separate ways. He refused, saying he was willing to change. Stupidly, I believed him. After we seemingly settled our mindset differences, he started talking dirty, saying that the moment I became his girlfriend, he would want to suck on my breasts, slap my butt, and so on. I said no for a few reasons: first, we had just started dating; second, I wasn't comfortable doing any of that; and third, where was the conservative mindset he had just a few weeks ago? The moment I refused, he completely turned on me, saying he couldn't do this anymore. He claimed our mindsets never aligned to begin with, and the most ridiculous part was him saying it was "nothing personal" since we were "grown adults" who should "get past this." I was so done with his B.S. that I just hung up, blocked him everywhere, and moved on. The thing that's still bugging me is that my friends are all saying he wanted to control and own me. They believe he realized he couldn't, so as a last resort, he went along with me just to get what he wanted and then leave.