Why does he always offers to help me?

We're friends and our families too ( we're both married). He always offers to help. Last time I was helping my husband with what he was doing , and something went wrong. He asked me why didn't I call him to help my husband. He said: "You know I'm into construction and
engineering and I could help him. You know your husband is not for that, and you do understand it, but can't do it."
He also offered to put led light stripe in my kitchen if I want. He said he is going to come to see what I need and to plan how it would be best to do it.
He always talk about himself as if he knows everything and always ask me if I want him to help me.
Why does he always offers to help me?
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