How could you forget cheating if you want to forgive?

My fiancé has betrayed me while he is in another country We have been away from each other for a year and 8 months due to the Corona virus He admitted that to me and that he spent 6 months with her.. He was deeply regretful and wanted to return to me because he found me the right person He told me that he did not love her, but he only sympathized with her and was affected by her because she suffers from a chronic disease (I have confirmed her illness), but she is a different person than him and is not suitable for him he knew her from work and was feeling lonely.. I love him and want to forgive him But how do I stop thinking about whether he loves her or not They had a sexual relationship and she got a (forever) tattoo on her arm for him

How could you forget cheating if you want to forgive?
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