SUBREDDIT: r/relationships
TITLE: [F20] having issues with friend [M21] and new guy [M23]
POST: So I've been friends with [M21] for three years and I very recently started seeing his friend, [M23]. So [M21] doesn't like someone that I hangout with so he doesn't invite me to parties at his apartment. Last night [M23] came over and I realized that either he goes to the parties there without me or he doesn't go at all.

 I feel bad because I don't want him to not me able to see his friend, but I want to hangout with him to. I've only been talking to [M23] for about a month but he doesn't know about the situation. I am just asking to see if I should tell [M23] about the situation.
TL;DR: 
I'm talking to a friend of a friend. I am not invited to my friends parties but the guy I like is. The guy I like doesn't know about the situation. Should I tell him?