The first one yes but the second one I would just step in and pull them apart and if the other girl started hitting me or something then would i fight back

This tbh

if a girl wants to hit someone she should be prepared to be hit back, simple.

I'd never hit anyone.. so no.

I'll throw ha ass away in both scenarios

As a girl
I think its ok to physically restrain a girl
in scenario 1 even a couple of hits would be deserved but its never ok to hit them enough to cause actual damage

Yes and no.

But as much as possible, I don't want to hit any woman. (I mean I don't want to punch/kick/physically fight any woman )

It is never okay to hit anyone. In extreme scenarios where you have to fight back in self defence fine, otherwise no. In any other case, Men are genetically stronger than women so its not a fair fight. You're gay, not female. Always remember

Scenario 1, yes!
Scenario 2, she's my sister, but I'm not up for the "an eye for an eye" scenario…

No.

Don't hit in either situation.
I think it's only ok if the girl hit you first.

Or is attempting to hit you