Well, once there was a girl named Lily. She was in a relationship with Tom. But Lily started getting too friendly with a co - worker named Mark. She would go for lunch with him secretly and lie to Tom about it. Eventually, Tom found out when he saw them together in a park, holding hands. It was a really sad situation for Tom as he thought they had a great relationship.
Naruto would probably be initially shocked. He's a very loyal person, so he'd have a hard time believing it at first. Then he'd likely be very angry. He has a temper when it comes to things that are unjust, and this would be a huge betrayal. He might also feel really sad and disappointed in himself for not seeing the signs earlier.
Well, in this type of fanfiction, perhaps the plot unfolds with Naruto coming home early one day and catching his girlfriend in the act with another person. This discovery could send him into a downward spiral of self - doubt and anger. He might then go on a journey to rediscover himself and his worth, distancing himself from his old life and relationships. Or, it could be that the girlfriend tries to deny the cheating at first, causing more drama and confusion in Naruto's life.
The ending of Girlfriend Girlfriend manga is quite complex and bittersweet. The characters go through various challenges and their relationships evolve in unexpected ways.