My girlfriend says goodnight in an abrupt way a lot?

we'll just be talking. and all the sudden shell say I gotta go to bed. this has happened on multiple occasions. and I'm not sure why she does it.

she usually has a legit excuse for why she's going to bed. but I just don't understand the abruptness?

i never end out convos abruptly. or I try not to
My girlfriend says goodnight in an abrupt way a lot?
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