How to change the friends with benefits to a relationship?

So for a year and a few months I started seeing this guy, he’s 20 and I’m 21, we were seeing each other all this time and yes we had sex a few times it’s been a on and off thing, at some point when all of this started I asked him if he liked me or if he saw this going and he told me that he doesn’t know that he’s not ready because he’s starting his career and he’s focus on his job.. well so do I I’m full time student and I work full time as a CNA but after that I kept my distance from him I still talked to him but went back to have sex with him... well the last time I saw him about a month I don’t know since then I’ve been thinking about him more and I’m probably liking him more than what I expected and yesterday he texted me to go over to his place and I said no and I told him I was tired of him seeing me as his booty call, that the only time he would look for me it was when he was horny... that I was more than just a booty and a 😺 well he said that he didn’t thought I saw it that way and that he didn’t want to make me feel the way I feel but that he doesn’t really want a girlfriend for now because he won’t be able to give that person the time she deserves and honestly I don’t know what to do because I obviously went really strong on him but at the same time I probably like him and still want to keep seeing him... I probably don’t have time for a boyfriend either but I just want to be stuck as his booty call like I want to be more than that