Very flirty and talkative over tect, quiet, silent and avoids me in person?

Anonymous
We text a lot, throughout the day or for hours at a time and send silly suggestive memes we find online. When i text him about something serious, he changes the topic to sex or something sexual.
In person, he gets quiet, can hardly look at me, would rather pretend that I'm not there or sit away at a distance. It isn't because he hates me or anything... it's like he doesn't want to seem obvious maybe? He just nods and then sits down or glances at me silently. If i happen to come in and sit next to him, he is silent at first then will finally have the nerve to speak to me but never looks at me. He does not act this way with any other girl!! He watches if a guy approaches me and hits on me! I hate the awkward silence!

Please help!! Why would a guy act like this?
Updates
+1 y
If he is shy, why does he looked at me so freaked out or scared in person? We know eachother very well. Im not judgmental or mean. I'm always so happy to see him but he looks at me so worried or like he has a stomache ache! What the heck?
Very flirty and talkative over tect, quiet, silent and avoids me in person?
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