<human>: I've been dating this person for over a month, I met him last year. He had an 8 year relationship with a person he lived with since the very beginning of the relationship, and they broke up by the end of last year because he had stopped enjoying the relationship and wanted to grow apart from her. 

We started dating around june this year and this is when he finds out this woman he was with had cheated on him last year while they were still together. 

They have spoken a lot about it but he's obssesed with knowing what went wrong to learn from it and never let it be repeated, but she won't tell the truth and even if she did, he has trouble believing her. I wanna help him get over it but I don't know if he'll get over it, how could I help him?
Should i stay by his side or step aside?
Can this be helped?

Can you provide a brief overview of the text?
<bot>: dating person who was cheated on last year after 8 years of relationship. Do we have a future and can I help him get over it?