Boyfriend was going to meet up with another girl? Have your cake and eat it too?

my boyfriend of nearly 4 years planned a trip to panama with his buddies...i found on his email where he was trying to meet up with a girl there...he says he loves me and I know he means it but why do guys try to talk to other girls?
Boyfriend was going to meet up with another girl? Have your cake and eat it too?
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