Boyfriend won't include me in his friend group?

My boyfriend and I have been dating for 2 years now and we live together. He won't add me to his friend group's chat (the other significant others are included), if we aren't together at the time (I'm with my parents and he's at his for the weekend) then he doesn't invite me to join the online games they play together. He told me that they all played a game together a couple days ago that he set up, and he didn't even ask if I wanted to join. I've met all his friends in person and have hungout with them, so it's not like I've never met them or they don't know me. I've talked to my boyfriend about feeling excluded and he doesn't seem to care. I hate feeling excluded and I am the only significant other in the group that isn't included in things. What should I do?