For the more introverted guys, is to common to pull away when you really like a girl and how do you express interest in a girl you’re getting to know?

I’ve just started getting to know this guy who is a bit more introverted, and we get along really well. I honestly can’t even tell he’s introverted/nervous around new people when we’re together because of how well we hit it off. He mentions that he’s also an over-thinker, and I’m a bit nervous that he’s just going to pull away at any moment. We talked previously, and he abruptly stopped talking to me and then came back months later and said he thought he made a mistake. I can usually tell if a guy is interested in me, and I genuinely can’t tell if he is or what he’s looking for exactly. When our dates end (even if we are laughing nonstop and bantering well), he side hugs me quickly and we get into our cars and leave. Just nervous that he’ll decide to just stop talking to me one day like the previous time. I’m enjoying getting to know him and trying not to worry, but it’s hard to carry on or even for me to reach out first because I’m scared of him rejecting me again.

For the more introverted guys, is to common to pull away when you really like a girl and how do you express interest in a girl you’re getting to know?
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