If you were dating someone who only sees you when it suits him, ask yourself what is happening with each of you.
Does he want power and control?
Is he a narcissist?
Is he using you for something he wants when it is convenient for him?
Why do you allow this?
It is a natural part of the human experience to wear many different “hats” and behave differently depending on what context we find ourselves in.
For example, we may act differently at work than we do when we’re spending a night out with our friends.
In some ways, it is to be expected that your partner would act differently with his friends than he would when he is with only you (you probably act differently, too!). However, it can become problematic if he is almost turning into a different person with them and if he’s displaying traits that you really don’t like.