Personally, in my experience, only a tiny few friendships with male friends haven't led to some sort of feelings on one side or both. That doesn't mean you can't be friends though. One of my really close friends I am still close to since school, he has made it very clear, even when in relationships that he wants me. If me and DP split, he would be here like a shot, and has said before that he would make sure that me nor the kids would want for nothing. But, he knows that I only view him as a very close friend, so he never tries to hit on me, or make things uncomfortable. He just always tells me he loves me when signing off on messages etc.
Other friends I have ended up being intimate with, and am still friends with them to this day, although not exactly close. And then, OTOH, I have others which are simply just friendships, with no feelings whatsoever on either side. But as I said, compared to how many have led to feelings, they are very few but it isn't impossible.
At the end of the day, if you can't trust your other half to not stray with their friends, then IMO, there is no relationship. You need trust to make a relationship work.