just asking for curious

idk about that part of her finger touching you. the smallest concern would be that just being her habit or tryna make you cringe... or it's bigger than that.

to sum it up, you really gotta ask her yourself to find out the answers.

I sense gay activity

I agree.

It's more likely she's interested in you. from what I've learned, a handshake like that usually means "I'm interested in you and want to get to know you on a personal level" or if she moves her finger between your palm 2 -3 times means "I want to get intimate"

Am I being rude? If I keep silent and pretend not knowing anything? (Although maybe she knew that I realised something from her)

I'm afraid to make our friendship become awkward. She's my best friend ╥﹏╥

Huehue yeahh she did it.

Thanks for the info

Omg
This comment made me laugh but also worried

Not really. Like the saying goes "ignorance is bliss".
I've gone through that phase before, it isn't nice when a friendship becomes awkward.
If you're still feeling bad about it, just sit her down and try talking it out. It helps the other person to understand that you're not mad nor happy about what she's doing but that you still care about her feelings.

Thanks again... It helps me a lot...

I didn't expect that something like this happening in my real life. (Usually I just read it in shoujo ai/shounen ai).
So I had no idea and being worried that maybe I'd hurt her (manga and real life are different ofc)

No problem.
It is true that manga and real-life differ from each other but, there are also times you can get some pointers from them.