So my LTR of 6 months meets this guy at a bar. She gave him her number and they talk.

Honestly no big deal. New friends, new people whatever. This guy is obviously interested in her and she responds with

"Wow this guy really wants to fuck me"

I just act indifferent and uncaring, mild amusement. Should she decide to do some bs, I walk.

Anyway, today she texts me saying that he invited her to lunch this weekend and that he's funny blah blah. I haven't read it since it'll show, but most likely it says she agreed to go and if I'm ok with it.

How do I approach this in a way that doesn't put me at risk of getting cucked or coming off as insecure?

I thought of approaching it as a regular GNO shit test, but I don't know if this is different and I should put my foot down.

Thanks.