What kind of person was Vincent?

What do you think of this boy's actions? Why did he do any of these below? What do you think his personality is? I will give him the fake name Vincent.

He was a boy I saw during his teen days.

This is what really happened about him during his teenage days:

He had a teen best friend and she was female. I will give her the fake name Sabrina.

They used to be inseparable best buddies from childhood to highschool. Then all of that ended when Vincent’s bully came to Sabrina's life. I will give the bully the fake name Samara.

Sabrina became friends with Samara and as a result, Sabrina turned on Vincent and also became his bully. Sabrina became Samara's minion. They formed a bully gang which is only made up of two members which are Sabrina and Samara.

The two girls often tried to gang up on Vincent and torment him but he often fought them ferociously without suffering any mental effects from their bullying towards him.

Samara was always the leader in bullying Vincent. She was always the lead in her friendship with Sabrina.

Due to how ferociously Vincent fought against the 2 girls’ bullying such as him beating them up, etc., Samara fell in love with Vincent.

Vincent took advantage of this so he did something that confused Sabrina in a way that she thought that he was trying to claim her back from Samara but Sabrina was surprised because Sabrina quickly realized that Vincent wanted Samara and not her so Samara became Vincent’s girlfriend and also had sex with her. Basically, Vincent stole Samara from Sabrina.

As a result, the bullying against him stopped and Samara often prioritized her time for Vincent much to Sabrina's annoyance.

Now with all of these said, what was Vincent thinking and doing at that time during his teen days? Why did he do all of those things? Also, what kind of people are Samara and Sabrina?
What kind of person was Vincent?
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