Does gender matter to become ones best friend?

Gender is no problem in making friends or having friends. The two of you just need to realized that you enter into a situation that you need to take care of some others feeling. Talk to your partners, assure them that there is nothing to be afraid of and just do what is right.

In the eyes of some individuals they do matter specially if they don't know the both of you. Yes they are just jealous but I think you a little distance between the both of you is needed when you are around your significant other.

If this guy is your best friend, then you would not be asking this question.
You should be asking, '

"how can i get my partner to understand my bond with my best friend"?

my best friend died last year, we were mates for over 20yrs, so, male or female, do not let go of that frienship.
I have had 3 'best friends' in my lifetime, 2 died, the other i hardly see these days, but still have contact with him.
Partners i have had a few, friends i have luckily had many, but they can come and go over time.

How I feel your pain!!!:{ I hate to say it but it can never last. One relationship is ultimatly doomed. My best friend since I was very young was a guy and we were never anything more than friends but.... then he met his wife and I met my husband.... it just couldnt work in the end i had to choose if I wanted my hsuband or my friend in my life:{ Well I loved my husband so much i had to let my friend go. I will however always have a place for him in my heart! Good luck to you sorry life is so hard sometimes!

It really doens't matter and it's completly fine to have a male bestfriend. You love both of them differently, and I see how that might be a problem between your partners. My best friend is a guy and it really doens't come between us and our partners because they understand how close we are and that we have known each other for a long time.