38/m. I do meetup groups. It is socially acceptable after the meetup to ask for any person’s number or social media. Even if you go from girl to girl to girl. I do it often.

But I struggle in other environments to do this.

For example I just took a painting class. One girl was talking to me the entire time. She was cute but dull.

At the end she asked me for a drink. I asked her to Netflix and chill. She said no.

There was another woman (did not know the dull girl but she saw us talking and she saw me get rejected). I liked this woman much more. We talked a bit during class as well.

I wanted to get her number but she saw me get rejected. She turned around to watch us. But I felt like if I made effort with her she would feel like a backup or it would be an ass move by me.

What are the rules in these situations? The way I fee I don’t know her name and I’ll never see her again so I got nothing out of it. But if I tried and got rejected it’s the same ending.

Any advice here?