He says "I have never felt this way before". How do I know he's telling the truth?

He says he's never felt this way before. He tells me that I'm all he thinks about.
How do I know he's telling the truth?
I want to believe him and he acts like he really means it but he has dated many, many girls before me.
is it possible that being with so many girls before and being 32 years old, he never felt such genuine emotions before like he says?
What do you guys and girls think?
He says "I have never felt this way before". How do I know he's telling the truth?
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