Is infidelity or cheating a sufficient reason to end a relationship?

"Nothing happened. It didnt mean anything. It just happened. I never meant for it to go this far."
"Nothing happened. It didn't mean anything. It just happened. I never meant for it to go this far."

Maybe the reason some people cheat and others don't is that some of us consider cheating to be a horrible and unforgivable breach of trust, while others might think, "I won't get caught but, if I do get caught, it's not that big of a deal."

So, two questions:

1. Have you ever cheated on a partner to whom you had promised faithfulness? and

2. Would you end the relationship if you discovered that your partner was being unfaithful?

1. I've never cheated on a partner, and 2. I would end a relationship if I discovered my partner was being unfaithful or cheating on me.
1. I've never cheated on a partner, and 2. I would NOT automatically end a relationship if I discovered my partner was being unfaithful or cheating on me.
1. I've previously cheated on a partner, and 2. I would end a relationship if I discovered my partner was being unfaithful or cheating on me.
1. I've previously cheated on a partner, and 2. I would NOT automatically end a relationship if I discovered my partner was being unfaithful or cheating on me.
Something else that I'll explain in a comment.
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Updates
11 mo
Of those who have never cheated, 85% would immediately end the relationship if they discovered their partner had cheated. Of those who have cheated, only 15% would immediately end the relationship if they discovered their partner had cheated. Do people who have cheated simply place less value on the role of fidelity in a relationship?
Is infidelity or cheating a sufficient reason to end a relationship?
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