Is it normal for my boyfriend to spend time with a female friend alone at her house? ?

He’s been secretive about her, saying that he never liked her, but things didn’t add up, his dad told me he recently asked her to be his girlfriend. I’ve never met her and when I suggest I meet his friends be says I only see them at work. Claims she’s not in to relationships, but keeps seeing her at her house, says she needs single male friends, everyone thought they were a couple.

Is it normal for my boyfriend to spend time with a female friend alone at her house? ?
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