My boyfriend is insecure about his stretch marks?

So my boyfriend of 2 months recently opened up about his body issues. He had been overweight almost his entire life and as of 3 years ago he lost a ton of weight. To me he looks normal and I had never seen him when he was overweight. We haven't been intimite because we're waiting but he did open up about how he's never taken his shirt in front of a girl before because he has stretch marks because of the weigh loss. How do i get him to be more comfortable about it. I honestly like him for him and i wouldn't judge or even care about them. he's a beautiful person inside and out and i hate that he feels this way. How do I help?
My boyfriend is insecure about his stretch marks?
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