I thought he said that she'd been obsessed with PSO. Anyway, yes, it's irrelevant if it's a phase. It's irrelevant if he's done it before and she's doing the same now. It's not OK to treat someone poorly just because they've done the same. Her actions are clearly affecting OP. Yes, she might be doing this because she got tired of cleaning and cooking, but they need to talk together. That's why it's irrelevant if it's a phase. If OP feels it affects him, that's all that matters. She might help him see that she just has a need to do this now, because some things are tough, or maybe it's something she's annoyed with the OP about. But so long as it's not communicated, it's affecting OP in a negative way. Talking about it is the only way to rectify that.
If it then comes to light that it's just a phase, and OP is OK with that, then she can have her phase. But OP doesn't have to suck it up "because it can just be a phase", which is why I stress that it's irrelevant.