What does it mean when a guy says he misses you?

Anonymous
Okay so long story short.
I have this group of friends at my university and recently became really close to this one guy. We’ve sat under the stars and spoke about our past etc.
like we really had some deep emotional talks. Even once when I cried he was there for me.
he also always tells one of my friends that he misses me and wants to visit me often.
Whenevr the group wants to hang out he always asks me to come along... even if I have an exam.
Recently... he went home for the weekend and he messaged me on his way back saying he missed me while away. I replied back with I missed you too and that he shouldn’t go away for so long. And asked % wise how much. And he’s like 90.
Being the slow person that I am. I didn’t know what to say.
I spent some time when he got back and then later during the night he messaged again and said... “I seriously missed you”

is it possible that this guy may have a crush on me?
What does it mean when a guy says he misses you?
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