I understand girls are just being polite and friendly, but I really wish they would tell me this from the start.

Like here I am thinking things are going great, we're vibing. This girl digs me and we're gonna go out. All only to have my hopes crushed by her being in a relationship.

I feel like asking if she has a bf in the beginning will scare her off.

What can you do to find out asap if she has a boyfriend so you don't waste your time?