How long would a relationship have to be for you to try and work through cheating?

Disagreement with my boyfriend.

I was telling him how my best friend's boyfriend dumped her because she cheated while he was out of town.

My boyfriend said "good for him, that's the only way to deal with a cheater" and I said to him "really? they've been together over 8 years, you don't think it's worth trying to salvage?" and he basically said "Nope! I don't care if they've been together 8 decades, you cheat, you get dumped, end of story" and I told him that people make mistakes, she's only human, but he still maintains this view.

I told him it makes me feel insecure in the relationship, that he would never fight for us if I made such a mistake, but he's refusing to budge.

Thoughts?

How long would a relationship have to be for you to try and work through cheating?
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