Mexican girl is unfaithful with her best friend

She knew that the way he was working her was more special than if they were just friends, so she tried not to spend much time with him, even less that her boyfriend noticed it because although he was not jealous she did not want him to worry about anything. Between them there was only a friendship and they would stay that way. However her plans changed when that day after the party at her friend's house, he offered her a ride home, there was nothing strange in that proposal so she accepted, but on the way she noticed how his hands were stumbling to caress and in the heat of the moment she also let herself go.