I feel left out when my boyfriend makes plans without telling me. What should I do?

Anonymous
We've been together for 3 years and live together. I'm a homebody but my boyfriend is a social butterfly and loves to go out with our friends. Normally, he asks if I want to go out to places with others, but most of the time I'll just stay in watching Netflix. I did tell him even if I decide to stay in, just keep me in the loop with plans because I want to know what's going on. We talk to our friends (who are fairly new people since we recently moved) through group chat but due to the overwhelming notifications I get daily, I turn the notification off so I never see them right away. This past year, it's gone from hey wanna go out with me and so and so to me discovering he made plans I stumbled upon through group texts but says nothing to me about it in person. I bring it up every time it happens but now it's making me feel resentful. This past weekend, he told me in a passing comment, not even directly inviting me to come along, that he was going to an event. Later I found out he invited our new friends to come to the event and then made plans to do stuff afterwards. I literally had no idea until I tried to get a hold of him (and discovered the group conversation) because it was late and I hadn't heard from him. I shouldn't have to find out in group chats since we're in a relationship and freaking live together! He says it's because i usually don't go out that he doesn't think to tell me but I have to keep telling him just keep me in the loop over and over. I am feeling so resentful towards him I can barely speak to him since this last argument.
I don't know what to do. Please advise!
I feel left out when my boyfriend makes plans without telling me. What should I do?
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