Why would he turn down casual sex?

Anonymous
Him and I, we have known each other for 4 years now. In short we dated for a bit, but I rejected him because I couldnt commit to something serious at point in my life. 2 years later he tried to pursue me again, but we just ended up just hooking up.
i found out he was moving and reached out to him to wish him luck. He told me he plans to marry me. the convo then got serious and he told me he liked me and always has. He said he wanted more then just hooking up. He said the ball wa sin my court. He came back to visit a few times and we would try to drunkenly kiss me. I would usually turn him down but sometimes gave in. We didn't really talk when he's away. He was just here a month ago. I saw him a few times but when he tried to kiss me I said we were jut friends he kept trying. and the last weekend he was here i had friends over and didn't invite him. He showed up with our mutual friend. He once agin started talking about how he sees a future with me. We ended up making out and he slept over. he tried really hard for more but I refused. The next day I told him we could have casual sex before he left. He said he had a work thing in the morning the next day and then i never heard from him before he left.. why would he try so hard to get with with me and I said no at the moment but when I offer it to him so easily he didn't go for it...
Why would he turn down casual sex?
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