Am I in the wrong?

So me and my ex broke up about 3 months ago. But we've been sleeping with each other quite a lot since our breakup because we are still such good mates now. But I've also slept with two other people during these three months. Am I betraying him in some way? Or am I not doing anything wrong as I am single? I'm really hoping for mature answers pleaseeee. No hate. 

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