Though, undoubtedly, a scenario like this comes with risks, it isn’t a death sentence to a romantic relationship.

The anxiety you feel about a girlfriend having a guy best friend triggers scary scenarios in your mind.

There is a fear that she is going to cheat on you with this guy best friend, jeopardizing your relationship with her.

These fears are warranted to an extent.

Know her history with this guy best friend before jumping to conclusions.

If she has dated this guy in the past, there is reason to believe that she is going to be tempted to do so again in the foreseeable future.

If she has hooked up with him in the past, there is good reason to believe that she is going to do so again in the foreseeable future.

Now, in a scenario where she has never done anything remotely close to dating this guy, or hooking up with him in the past, you have less cause for worry.

She has had ample opportunity to be romantic or physical with him in the past, and never has.

This is obviously the best scenario.

Now, if she has dated him in the past, knowing how long ago that was is relevant.

In the event that it has been several years since they dated, there is less cause for worry about getting into a relationship with this girl .

As long as a wide berth of time has elapsed since they last dated, it means that they have settled into having a platonic relationship as friends.

This doesn’t completely eliminate the chances that they get back together again in the foreseeable future.

But it is less likely they do, given the amount of time that has transpired since they last dated.

If, on the other hand, she dated this guy and broke up with him recently, you have greater cause to be worried and unsure of your relationship with her.

A recent breakup is an indication that there hasn’t been enough time for their romantic feelings for each other to dissipate.

In cases like this, you are a rebound to this guy.

To determine whether this is what you are dealing with, pay close attention to how she talks about her best friend.

Is she constantly talking about how she was done wrong by him?

This means that she hasn’t gotten over the breakup.

This means that you are a rebound and she is primed to go back to her ex the moment he opens that door.

He won’t remain her best friend for long once this happens.

In a different scenario where she has hooked up with him in the past, but never dated him, the number of times they hooked up and how long ago these incidents occurred are critical.

Let’s say she only hooked up with him once, and that was several years ago, you have less to be worried about.

Stuff like this happens among friends when people are in-between boyfriends or girlfriends.

Nonetheless, if she has hooked up with him several times over an extended period of time, and relatively recently, she is going to do so again with him the moment she hits a rough patch in her relationship with you.

All considered, it is not absolutely certain that this guy best friend is a threat to your romantic relationship with her.

Any relationship is risky, regardless of whether you are dating a girl who has a guy best friend or not.