When I can consider myself an official girlfriend?

The other day we went to the restaurant and there were his friends too

He put his hand on my leg (upper knee/thigh) and kept it there most of time

Is this one of the signs or what are the signs i must look for?

Ah also his 1 friend asked me if he gonna cook for me that night

And 2nd friend said its been cold last night and that i ust warm and take care of him

Are these comments telling... or? I seeing whats not there

When I can consider myself an official girlfriend?
Post Opinion