Is he just using me for sex?

I have been seeing this guy for some months now and it seems he only ever texts me sweet, nice and gentle things, say he misses me, makes me feel special, mention sex in a way as if to say I’m the only girl that can make him feel a certain way during sex just to get sex from me because the moment I gave in and had sex with him, after leaving him the next day, he ignored my calls and texts and then when he decided to finally get back in touch with me and respond his excuse is “I’ve been stressing. I haven’t talked to anyone all day.” “I sometimes go MIA and want to be to myself.” Which is funny because when we were just together his phone was blowing up with calls and texts and he didn’t ignore one of them. He was even replying to texts while driving.
Is he just using me for sex?
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