What are guys intention when they compliment another girl through DM?

Anonymous
my boyfriend of 8 years had complimented a handful of girls telling them they are pretty, beautiful or gorgeous though instagram DM. it made me so uncomfortable simply bc i am so insecure about myself. if a man has a girlfriend, what are your intentions with said girl if you compliment them through instagram DM?
What are guys intention when they compliment another girl through DM?
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