Am I wrong for feeling this way ?

So recently I been seening my boyfriend play with this girl online, I understand that he can have other friends who are girls but he seems to play with her a lot, whenever I'm not home and when I ask him what he's doing when I see them both online he just responds "games".

I've told him before that I'm a little iffy on him playing with her so much because he sort of neglects me when he does, like leaving me on read or not messaging me at all. A lot of the times he says that he just gets really into the game and forgets about everything else, but whenever we play together I can always see him check his phone

He's also countless times when we're spending time together just on his phone or texting someone and when I ask who it is and he won't tell me names, he always calls his friends "my friend" and I asked him about why he does that and his reply is just that's how he's used to saying it.

I've asked about their relationship and about her, and he said he's known her for a long time (about 4 yrs?) And that nothing happened or ever will. And I do trust him with that but I can't help but feel iffy and I don't know if it's jealousy or something else. I really hate feeling this way and I don't want to feel controlling or be that kind of girlfriend that won't let her boyfriend talk or play with other girls.