Would you also feel weird if you see this from the girl/guy you’re seeing?

I’ve been serious dating someone for almost a month. Met his friends and family. We aren’t officially a couple yet. Tonight he told me I’m like a girlfriend to him.. we talking official. I opened up a lot and told him how I was curious about what happened this past weekend at his family event. He is 31. He has an older sister who’s 11 years older than him. They’re close and he’s the baby boy. When she was drunk, she took his face with both hands... stared at him.. and gave him multiple kisses on his right cheek, then left cheek.. and a little down his neck what seemed to me. I felt so fucking Awk.. like sure I think it must be family love but it made me felt like it was incest... and his face looked like embarrass by his older sister... but I don't know as much as I wanna endure it I also felt awk af. So I asked is that normal and where did she kissed him to confirm if what I saw was correct. He said it is sometime normal when she’s drunk. I told him I felt uncomfortable especially the neck kisses as I think that’s intimate. He said he don’t feel weird or bad cuz that’s his sister love like his mom would.. and she is just like that touchy feeling affectionate when drunk.. and I told him if I asked him to stop the neck kisses in the future if I feel uncomfortable.. he said he wouldn’t cuz it’s normal and he can’t stop it cuz it’s something has happened a long time before. And I just started crying.. cuz I don't know that’s so weird and uncomfortable.. like I don't know if I’m with him, I’m gonna have to endure this? Like I don't know maybe I’m being over reacting emotional.. and I hate this cuz I do really like him and his family... but it’s so fucking awkward to endure this shet.. and he’s not gonna try to stop it? Nor feel bad?
How would you feel if that’s your boyfriend/girlfriend or potential girlfriend/boyfriend who you wanna be with
Would you also feel weird if you see this from the girl/guy you’re seeing?
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