Questions: Flirting

The amount (and type) of flirting and approaching a guy can get away with is down to his looks.

Does this apply to you guys too? (I think it does, but we’re more likely to laugh before we creeped out)

A while ago, in my music class in college I got the attention of another female students. I even asked a question on here in regards to her. https://www.girlsaskguys.com/sexual-behavior/q2655119-is-it-weird-that-i-like-larger-women
We never officially had a conversation but she always sat next to me in clsss and we’d always glance at each other and smile. I did give her some hints that I like her by asking her random questions “what day is the exam?” even though the date of the exam was on the board.

They way I found out what her name is was when the role sheet got passed around the room, I got a quick glance of her name on the sheet and memorized, I then went on my social accounts typed her name to see if she has any social media accounts and found out she has s Instagram account. I saw her browsing her instagram account in class so that tells me she’s s active user.

On the last day of class a few weeks ago, I noticed that she kept glancing at me while she frequently rubbed her thighs. It was during the final. I finished the final before she did so I left earlier than her. On my way out I simply said “bye” and she replied “bye” and as I left I could see sadness on her face. I felt so bad that I didn’t get to know her better. I don’t know if I’ll see her in person again and if I do it will probably only be briefly when walking to another class. So I want to know if it’s okay to follow her on Instagram. Or is it kind of creepy?

What do you girls think about boys who are really direct and aggresive in their flirting? Because whenever i flirt i tend to get physically pretty fast... And it seems to me that the girls like it and i've never been pushed away or something for doing it.

But last time a friend of me said to me that she found it a little bit rude and weird that i do that. In this case i had just met a girl at a party and we were talking and flirting and i just grabbed her ass because i felt like it. I'm sure she was totally fine with it.

So is it actually weird that i do that and should i approuch girls more carefully, or is it good when a boy flirts a little bit aggresive?
(sorry for my English ;))

Let's say the girl is in her late 20's.
Let us say this email is sent in response to a congrats email on a work project.