How do open relationships work? Is this toxic?

It feels really odd to me that I just met this guy and he seems really into me but says he never sees himself being monogamous. The first date was really emotionally vulnerable. I spoke about a lot of trauma and he held me, told me I was strong, kissed my forehead.

I said I didn't think I could do an open relationship and he posed several "pitches" to try to get me to see him again.

He texts me often, wants to talk on the phone and wants to go on dates. He seems very kind and everything i would want in a relationship. He treats me like we are in a relationship already and he seems very open emotionally.

My experience with guys who want things casual are fuck boys, playing games, not showing any interest and just wanting sex.

I'm really confused.

Can someone explain if this is normal for someone who wants an open relationship? I don't understand it.

How do open relationships work? Is this toxic?
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