Guy doesn't believe my love is real. He thinks Im playing joke. How to overcome?

I have rejected him previously. 4 years later he jumped into another and got cheated by the girl twice.

Now I moved back to hometown and is trying to talk to him. Mostly to apologise for being rude. I have also developed a romantic interest with him. But he thinks it is all a sillyjoke of mine.

Guy doesn't believe my love is real. He thinks Im playing joke. How to overcome?
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