My dad has been on and off with his girlfriend for years now it and makes me uncomfortable as he tries to get me involved what should I do?

I feel like every time I see him he tells me he’s blocked his girlfriend and then 2 days later he will talk highly of her I’m just feeling exhausted and tired of hearing the same problem over and over

My dad has been on and off with his girlfriend for years now it and makes me uncomfortable as he tries to get me involved what should I do?
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