Good question, dlishguy. I think a combination of both, although more with respect to timing. Right now, because Sarah has been a friend for so long before I was dating my GF, she's this unknown variable (until/unless they can eventually meet).
As for friendship, I think my GF wouldn't care as much if I became very good friends with a girl post-us dating; she would at least probably know the girl and our relationship would have already been established before I became friends with another girl. However, she might still be concerned if I started getting very close with this other (like as close as I am with Sarah), maybe thinking I'm losing interest, becoming more intimate with this other girl, or that this other person is a threat to our relationship. I don't know that that would necessarily be the response, but it is a possibility.
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