OP, whilst you feel sad, it is important to remember that it would be sadder wasting more time on this man.
His messages will be about the panic he is feeling at losing what you do for him. Nobody who truly loved and valued another would ever try to hurt and demean them this way.
I know a family where a relative's 70 year old husband made a pass at the 22 year old niece. He actually orchestrated a situation where they were alone and based on what happened, he truly thought this beautiful, educated young woman would respond in his favour. It blew the family apart for a while as the repucussions rippled through them all. He had entered the family via a late life marriage and clearly felt the risk was worth it - all because of his sick sense of entitlement.
I am with another pp who said many men would turn their backs on wives of 30 years for a 25 year old. I am early 50's but devoutly single after mistreatment and infidelity ended my own marriage. I feel I have been given a gift by feeling the way I do about being single, and I enjoy every aspect of the freedom and peace of mind it gives me.
Once your sadness subsides, try to reframe your thinking around this. He might be really great in many areas of your life - 2 things can be true at same time, but he says things that reveal someone who doesn't see you as his equal, views younger women as objects to 'crave', and feels so strongly about it that he is compelled to share his lecherous thoughts with you.
No amount of DIY'ing, car assistance etc would make me entertain such a man a minute longer. I really feel for you. You don't deserve this, and he definitely doesn't deserve you.