Why does my girlfriend dad act jealous when she talks to me?

Ok so I met this girl and we been talking for only 4 months it’s going pretty good I talk to her mom her mom is cool but when she gets around her dad and me and her are talking he gets jealous and he start being nonchalant towards her it’s so weird I feel like something more is going on but I don’t wanna accuse anyone or even say what I think it is

Why does my girlfriend dad act jealous when she talks to me?
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