Boyfriend lied to me should this be a deal breaker?

My boyfriend lied to me about one of his family members he told me about one of his cousins a few weeks ago because she was having a party now today he's telling me she's just a family friend and his babymother aunt is it weird that he's still dealing with his exs family and lying about it we have had problems in the past with infidelity
Boyfriend lied to me should this be a deal breaker?
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