Most Helpful Guy
So here is how I look at this and I take it very personal because this happened to me and it has basically ruined my relationship with the woman I am dating. We took a break because she needed it. She ended up sleeping with another man. The break could have made us stronger if she got to that point ad then stopped herself. I really loved her and since I have never felt the same about her. I still love her but I have a sense of disgust with her for what she did and I am struggling with it. She made a mistake and came back to me about that and was sorry and all that but I still suffer from it and will likely leave her. She completely regrets what she did and I know that but I am disgusted by it even though I still love her.
So to answer your question, while it is not cheating, do not do it just for the sake of having sex if you ever have any hopes of reconnecting with your person you are on a break with. For one, if you regret it, and you likely will, you will hurt everyone. It is not worth it. Take time to see what you really want and then if you "hookup" with this other person do it for the right reasons.