Why would a married in relationship guy be In desperation for me to do him little favors such as?

Like yesterday was his bday right? So at work I wished him happy bday like every one else would have! Either way he mentioned how he excepts “any” gifts and basically ended up asking me if I can get him a croissant 🥐 I have gotten him once before so I laughed it off and anyways so later on through out the day he would ask like so are you getting me it right? I ended up not getting it the next day as it looked like he was quieter as usual and didn’t really seem approachable but than said a few words and said I’m just tired na na na and than ended up saying just give me the address I will get it myself and I don't know what’s up with this guy like why he being like this towards me anyways

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Speaking at of that he always says good morning he didn’t even say it the next day
Why would a married in relationship guy be In desperation for me to do him little favors such as?
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