Feeling left out

I'll start out by explaining that my husband has "boys night" every Friday. I feel like it's slowly turned from "boys" night to "get away from my wife night". Tonight was the cherry on top when I'm on Snapchat and see all the snap stories and Snapchats of his whole family over at his mom's. Both my sister and brother in laws and their 1 year old daughter, my niece and my son's cousin. My mother in law sent me a video of them playing a game. Not once did anyone think to ask me to come. Not either of my sister in laws. Not either of my brother in laws. Not my mother in law, and not my husband. I replied to the video my MIL sent me saying "I like how Chris's boys night turns into family night and we're (son and I) not invited." Then a couple minutes later I get a text from my husband telling me to come over. Um no, you're only saying that because your mom said something to you and you don't want to fight. He's been there for 4 hours, plenty of time for him, or anyone else, to invite me. Maybe I'm being overdramatic, I'm not sure. Just needed to vent. I got married to have a partner and not feel alone but I'm feeling a hell of a lot of loneliness right now.