In the future send one message and if she doesn’t respond don’t send her another message or block her…. Don’t even unfriend her. Meditate and brush it off, act like it’s no big deal. If you bump into her just talk to her normaly and that’s that…. You may not end up dating her.
Here’s the thing though… If you start blocking girls the word may go round and other girls may find out and start acting strange around you.
Girls observe how you interact with others. If you handle these situations with class and are genuinely nice to others around you then other girls will notice and some of them may develop crushes on you 😉