Guys, Why are guys weird with texting?

Iv been seeing a guy for close to 4 months always attentive with texts as much so now as it was in the beginning but as soon as he's out with other people i dont hear from him not even drunk texts….. things between us are generally great but if im drunk the person i like is still always on my mind and i always reply and respond.
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Do guys just prefer not to be bothered when out or busy it always makes me doubt things and my mind goes into over drive
Guys, Why are guys weird with texting?
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