How long do you wait? Should it be considered cheating?

My boyfriend plays the "he loves me, he loves me not card" a lot. He'll say we're done and for me to move on. I never do because I know we'll be back together in no time. However, the last time this happened, it went on for 13 days. I made numerous attempts to reconcile but he refused. On the 8th night I was very upset and went out. I met a guy and we hit it off. On the 9th night we hung out and on the 10th night I slept with him. 3 days later my boyfriend wants to reconcile and I agree. I end up telling him about it and he's furious saying I cheated and can't be trusted anymore. Tell me what you think.

How long do you wait? Should it be considered cheating?
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