AITA for feeling kind of mad?

My friend, Wosi, is my very good friend and we've known each other ages. I really like her and would not to change anything. I also really like Colin, my friend, not romantically. We've been mutual friends for agee, and I always thought we all just went together. Never been to Colin's house neither had Wosi. But Colin invited Wosi and I feel really left out, because we've shared simlar interests and I've never gone round, so it seems excluding just to invite Wosi. Wosu told me, not Colin. AITA?