How do you get a guy to forgive you?

How do you get a guy to forgive you and text you back after a misunderstanding? He believes I lied to him about things I haven’t, his friends are backing him up and also ignoring me. he even unfollowed me on Instagram.
I’ve reached out this week and last week and asked him to talk about everything that’s bothering him so we can solve this, and nothing. He’s been ignoring me. I really don’t know what else to do. Any advice?
How do you get a guy to forgive you?
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