My friend with benefits says he loves me. How do I know he's telling the truth?

We have been seeing each other, on and off, for almost six years. Last November I told him we can't see each other anymore. Last week he texted me. First he apologized for intruding. Then, he told me he missed and thought about me a lot.

He also said he loves me and that the fact that he loves me means he can't ever forget me.

This wasn't the first time he said he loves me. He said many times over the years.

How do I know he's telling the truth?

My friend with benefits says he loves me. How do I know he's telling the truth?
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