This is a really complex situation. One possible story could be that the girlfriend might think her best friend needs some male attention and wrongly believes sharing her boyfriend in a platonic way can help. But this is a huge mistake. It often leads to jealousy and damaged relationships. In a relationship, boundaries are crucial. If you find yourself in such a situation, communicate openly. The boyfriend should also firmly state his discomfort if he's not okay with it.
Well, in some cases, it could start as something innocent. For example, the three of them might go out together a lot. But then things can get out of hand. Maybe the girlfriend feels like her best friend and boyfriend have a lot in common and wants them to be close. However, this 'sharing' can create a love triangle type of situation. It's important to remember that a relationship should be exclusive between two people, unless all parties have a very clear, consensual open - relationship agreement.
Sharing a boyfriend socially with a best friend can be a tricky thing. In some cases, it might work out fine if all parties are very mature and respectful of boundaries. But more often than not, it causes problems. The best friend might start to compare her own relationships to what she sees between the gf and the boyfriend, which can create envy. And the boyfriend might start to feel torn between the two relationships. It's important to have clear communication from the start about what is acceptable and not in such a situation.
One possible situation could be when a best friend forces you to do their chores or tasks all the time. You need to set boundaries firmly. Just say 'no' clearly and explain that you have your own things to do.
Well, in such a scenario in a novel, the character could start by reflecting on why she made such a mistake. Was it because she had feelings she couldn't control? Or was it a moment of weakness? After that, she might consider confessing to her boyfriend, even though it would be extremely painful. And she also has to figure out how to deal with the relationship with the best friend, whether to cut off contact or try to establish new boundaries.
Well, first of all, communication is key. If you suspect something between your best friend and your boyfriend, have an honest talk with both of them. Maybe it's just a misunderstanding. For example, I once thought my best friend and my boyfriend were getting too close because they always texted. But when I talked to them, I found out they were just discussing a surprise for me.
It could end with the wife realizing she can't tolerate it anymore and divorcing the husband. Then the husband might end up with the girlfriend or be alone.
My best friend's boyfriend was an artist. He often painted portraits of her. Once, for her birthday, he organized an exhibition in a small local gallery with all the paintings he had made of her. It was a really sweet gesture. Many people came to see the exhibition and my best friend was over the moon. This not only showed his love for her but also made her feel special in the eyes of the public.
There would be a lot of jealousy. Both the best friend and the person sharing the girlfriend might feel envious of each other's time with her. It could also lead to a breakdown of the friendship. If there are any feelings of inequality in the 'sharing' arrangement, it can create resentment.
If she gets jealous when you talk about your time with your boyfriend or if she tries to undermine your relationship in some way. For example, she might say things like 'He doesn't seem that into you' or 'You two are so different, it won't last'. These are all red flags that she might have an ulterior motive regarding your boyfriend.
Personally, I would cut them off immediately. There's no need to keep someone around who would stab you in the back.
If you find out your girlfriend is cheating with your best friend, you should first take some time to cool down. Don't make rash decisions. You can then talk to your girlfriend and best friend separately to understand their side of the story. But in most cases, it's hard to forgive such a betrayal.