Help, I lost him what should I do?

i was dating someone for 3 months we were in love but people got between us and made us break up by saying bad things about him to me and he thought i didn't love him bec he was out of relationship and had trust issues.. now someone told me the whole truth and what people said to me was a lie and he truly loved me what should I do? do we have hope or should i move on? ps he didn't fight for me back then bec he thought i loved someone else..
Help, I lost him what should I do?
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