There's a reason women don't give out their phone numbers or addresses over apps.
Maybe not to you
I would ask for at least a number after about 5 messages. If they gave me a line like "I need to get to know you better" I would just cut it off, because that's a sign that they are either
Using the app for attention/ego boost
In a relationship
A flake that will never actually meet up
etc etc and so on
I got a lot more "successful" (ie, getting laid) from dating sites once I stopped taking them so seriously.
People on GAF/REEE get so incredibly overinvested it's sick. Just because someone messages you back (even multiple times) it doesn't mean anything.