Should I confront him?

Ok so I am dating this guy for about 5 months now, he works in VA for 2 weeks then goes back to TN for a week for work as well, he has two houses (one in each state). Everything has been great, we’re falling in love, I’m happy. Although, I know he dumped his ex in December bc she cheated but she still lives at his house bc she can’t afford to move out and has no where to go. It makes me feel weird but I know how much they hate each other. BUT, he went home this week and went to a friends wedding. He sent me some pics of him and one of them was with his ex. They were just doing a basic pose, but they were matching. His tie matched her dress. A little weird. And she had a ring on her left finger, she’s not married. So, I went onto her fb and it still says she’s in a relationship with him and her profile pic is a photo of them from March. Am I crazy for thinking they’re still together? That’s all a little weird? If they hate each other then why is that on fb?

Am I crazy? Should I confront him?