Boyfriend snapchatting “cousin”?

So me and my boyfriend have been together for a year. He has always had this same girl on snapchat and constantly snaps her... He always says that it is his little cousin who is “16” years old. I have always been a little suspicious why they always talk... I did some snooping and saw that she isn't even 16 and she's like 20 and graduated highschool in 2018 so I dont know what to do. Why would he lie to me about her age? I dont even know if they are really cousins like actually.. he says that he's like his uncles wifes kid or something i dont know.. Should I confront him about lying about her age? I always ask why he snapchats her and he's like oh its my little cousin and brushes me off and I am kindve upset. 🙁
Boyfriend snapchatting “cousin”?
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