I noticed, and im sure many others did too, that the end of season 3, ted comes home, henry comes out of the house, greets him, and michelle is at the door. Henry ushers ted in, and shortly after they are at a soccer game with henry, where michelle says " come on boys", cheering both on? Are they back together?
This is exactly how I read the situation. Having someone who ALWAYS brings up a silver lining can be incredibly invalidating to your own feelings, especially when you know there’s more going on under the surface, and I suspect that was Michelle’s biggest issue with Ted.