It would be worse if you hadn’t rejected her and started dating her, only to break her heart later, having chosen to date her out of pity or convenience.
You are the judge of your own character and what it is that makes you attracted to a girl.
A date that blocks you on WhatsApp is not interested in you romantically, and wants to avoid the pressure of having to keep communicating with you.
People’s minds change.
Irrespective of whether you have been having a great time with your date on social media, it doesn’t mean that they won’t realize you aren’t the right person for them.
This is principally true if you met this person online, or use social media as a primary source of communication with this person.