Usually, one of the genders in an opposite-sex friendship is secretly attracted to the other.

Men and women are just different in how they see each other.

Biologically, we are built to procreate.

To this end, having a close friendship with someone of the opposite sex is essentially playing Russian roulette with the likelihood that someone has or develops an attraction for the other.

These friendships can last for many years, which makes you susceptible to thinking you have less to worry about.

You tell yourself that since they have been best friends for several years and have never hooked up, this must mean that they have no attraction for each other.

This is a misguided interpretation of their relationship.

There are multiple cases where two best friends of the opposite sex are friends for years but with one of them having an ongoing latent attraction for the other.

This emotional and physical desire doesn’t go away with the years.

If anything, they become more intense.

They get to experience the other’s ups and downs in life.

Deaths in each other’s families, health scares, heartbreaking endings to romantic relationships, corporate drama, and home relocations.

These are all emotional moments in life where they get to give each other support as best friends.

These incidents create stronger bonds.

Over the years, all this does is create a stronger emotional bond.

One that can easily instigate romantic attraction that is kept quiet over the years in the hopes that the other finally reveals their romantic feelings.

Additionally, these two best friends will expect to maintain the same interactions despite the presence of a new lover in the picture.

In other words, if they are best friends who usually talk to each other for hours every day, they intend to keep doing this regardless of whether they are in a serious relationship with someone else or not.

The same applies to two best friends who exclusively meet each other to hang out every so often at local hotspots without a romantic partner present.

Understand that these two best friends already have routines in how they interact with each other, and just because a new lover comes into the picture doesn’t mean they will change these routines.

When you come into the picture as a new girlfriend, he still expects to keep up his routines with his female best friend.

You don’t have the history he has with his female best friend.

The ups and downs they have both been through over several years.

Thereby, she takes precedence over you.

In time, you will likely get fed up with how much time they spend texting each other throughout the day or the time they spend together when they meet at the local deli or the local gym.

Naturally, as this happens, your survival instincts kick in.

You want to set boundaries, given that you worry about how this could complicate your relationship with him.

But if you talk about boundaries with him, he is prone to reacting negatively.

He sees it as you making a big deal out of nothing and being insecure.

All of this being said, a boyfriend who has a female best friend isn’t assured to cheat on you with her.

Nevertheless, to be on the safe side, you shouldn’t be okay if the person you’re dating has a best friend of the opposite gender.

It presents an unnecessary complication where boundaries are constantly tested in your relationship thanks to the presence of this best friend of the opposite gender.