His behavior is dependent on how good either girl looks on a particular day.

If one of the girls in the same class puts extra effort into making her outward appearance more appealing, he pays more attention to her on that day.

Were you to look particularly good on a given day in your outward appearance and the other girl doesn’t, he would act by giving you more of his attention.

He is attentive towards you by making conversation, looking at you frequently, and even flirting.

Since he likes two girls in the same class, the girl who does something extra with her physical appearance on a given day will often get more of his attention.

Furthermore, the body language of either girl is important.

There will be days where he walks into class and gives the girl who presents the most positive open body language his attention.

Were you to be in a bad mood on a given day, with a frown on your face and your hands crossed over your chest, he notices the negative, closed-off body language and avoids you.

On the contrary, if he looks over at the other girl and she is smiling and looking relaxed in her body language, he is much more likely to give her more of his attention during class.

This is where he is looking at her more frequently, smiling at her, flirting, etc.

On days like this, you will feel like he is ignoring you.

However, he is merely responding to your body language.

When it is negative and closed-off, and that of the other girl is positive and open, he will act accordingly by giving more of his attention to the other girl.

In addition, a guy who likes two girls in the same class will sometimes test them by occasionally giving his attention or flirting with a totally different girl.

He does this to see how the two of you will react.

If he sees emotion in how you react, whether it be one of shock or confusion, it lets him know that you like him too.

This is reassuring to him, as it confirms he hasn’t been delusional all this time.

If he notices that the other girl never or rarely reacts emotionally, he will come to the conclusion that you are the one who genuinely likes him back or likes him the most.

To this end, whenever he is in class, he is far more intent on observing your body language over that of the other girl.

As long as he observes positive and open body language on your end, he makes more of an effort to engage with you.

This is where he compliments, flirts, teases, and repeatedly initiates conversation with you.

All the while, he observes your response.

As long as your energy is sufficient or matches his, he feels the romantic chemistry building.

Eventually, it builds to high enough of a level he is excited about the prospect of asking you out on a date the next time he sees you in class.