My (24f) partner (26m) started a D&D campaign without telling me.

I recently started seeing someone new (we work together). We’ve been talking about starting a new campaign together as a kind of bonding experience because we both enjoy D&D.

However, a couple weeks ago he started a campaign with several of my friends, (the longest of which I’ve been friends with for 3 years) and although they all know I enjoy D&D, no one thought to invite me. For clarity, my friends work at the same place as us, but he barley knew them.

I mentioned to him that this upset me, and he said he “didn’t think I’d want to join.” This is odd because I’ve been asking him to DM for months. He did apologize and invite me, but at that point I felt like it was because I forced his hand and that if the party had wanted me there they would have invited me before the campaign started.

I’m not sure what to do. Campaigns can go in for months/years, which makes this kinda awkward. Every time he and my friends go and play together, I am reminded of the fact that none of them even thought of me when planning this. It makes me sad. I don’t know if I can do this every week indefinitely.

I feel like I’m being kinda juvenile, but I feel let down by him and by my friends. How should I move forward?

TL;DR: My partner and friends started a D&D campaign without me, and I’m hurt. I’m looking for advice on how to move forward.