He becomes distant after making out/fooling around

My boyfriend and I haven't been together for that long.. And he really likes me because he is the one who always makes the first move.. Asks me out on dates, writes me messages.. But I have noticed that he becomes quite distant after making out and more.. He has never had a girlfriend before and is quite shy.. But for example yesterday... we talked for hours.. He opened up.. Then he started kissing me.. And after fooling around he couldn't even look me in the eye.. I don't get it
He becomes distant after making out/fooling around
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