How do I fix things when nothing’s broken?

We didn’t have a big fight or anything—he didn’t cheat that I know of—but something shifted. It’s been six months since that party at his sister’s, the one where he got drunk and went into the back room with his ex for ‘just a minute.’ He said it was nothing. They were just talking. But he wouldn’t tell me what about. And now it’s like there’s this wall. We still go to church on Sundays, still sleep in the same bed, but he doesn’t really look at me anymore. I keep waiting for him to say something—apologize, explain, I don’t even know—but he just acts like everything’s fine. I asked my mama and she said ‘if he didn’t cross the line, let it go’ but you can’t sweep silence under the rug. It’s not about sex—it’s about the way he closed off. Like a door shut and I wasn’t even given the chance to walk through it. Did I imagine the whole thing? Or am I supposed to just pretend I don’t feel this hole?