Can this be a red flag or am I overthinking?

Hello, so this man that I am going out with now (Which happens to be a gentleman, sweet man, really good, I have never gone out with a man like this. he is quite older, he is 46 and I am 29 going to be 30. Anyways he was married for 10 years and now he is divorced, his ex wife is way older than him she is almost 60, weird but true, and they still speak, and the other days she called him an he did not answer, but he had told me before that she calls him and asks him to go to her house an fix her car or to do this or that.

She lives in another city like 2 hours from were we live. he told me that he appreciates her very much, but he cannot even have the thought of kissing her or anything, he wants her very much, appreciates her but that’s it. so I did get a little jealous and my mind was wondering, if he still has feelings for her rooted in him. its not like he talks all the time about her, but when he mentions his past and brings her up, I feel weird.he was 31 when he married her and she was around 44, I wonder if he married her for his papers to be here in the states.