Why would a guy send a girl a picture of his bicep?

Anonymous
I’ve been talking to a guy and he is kinda introverted. We went out once and he mostly smiles and talks a lot when we’re together. On Snapchat, he usually sends a lot of 😂 emojis and the other day, he sent me a picture of his bicep. I told him he looks good and he was like are you being sarcastic? I don’t know what all of this means. He’s complimented me before (e. g. outfits).
Why would a guy send a girl a picture of his bicep?
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