Sometimes people will talk to you just to try and be nice. Maybe this was one of those times, and she wasn't interested in talking to you.

Hmm
It is creepy to her that you kept an eye on her profile.
You can prevent this from happening by not placing expectations on women here. Just let them do their thing.

I suggest not getting too attached to anyone here

Don't talk to anyone. That's the only way of preventing what others do.
You can't.

I've been blocked by people i never even talked to,lol

There's no lesson to be learned, beyond the fact that there's some seriously weird people on here - and I think it's impossible in advance to work out which camp the person you're chatting to is in

who blocked u bro

Just life on SW its not you!

Probably you’ve said something she doesn’t like

Peoples feelings change . That’s the lesson.

Only way would be to not talk to anyone here but that would defeat the whole purpose of sw

Don’t talk to them or anyone

Sadly there is nothing you can do. This is just the way of SW. The lesson to learn is don't get emotionally involved in relationships on here.