Things were going great, now he says he can’t give me what I need?

We ended 7 years ago. During that time, he mer someone else and they had 2 kids together. But then they split because it wasn’t working. Enter me again. We’ve had a wonderful relationship these last 4 months, telling her that he loves me and is going to be with me forever.
Then she messages him and says she wants him back.
Suddenly, he’s unsure. He left me hanging for 3 days and messaged me maybe twice. I even went to his house to talk to him.
Then yesterday he came and told me that he doesn’t deserve me. That he needs to be alone. He says he said the same thing to her.
We split. But I just need thoughts.
Things were going great, now he says he can’t give me what I need?
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