Has your female friend met your girlfriend? How does she treat her?How doe she treat you when you see her in public ! Does she pull your hand and take you around a party leaving your girlfriend behind? Does she make comments about your girlfriend pointing out flaws or does she always take your side when there is a disagreement? Men and women can be friends but my friendships with men were only completely non- sexual or non- flirting when we talked about other things or mutual interests. Looking back 20 to 30 years ago my best guy friend at the time was definitely of the flirty variety . My other guy friends definitely didn’t have that energy and we would talk about lots of other things and there was no sexual energy.