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Depends on what you you want in your life. If you still have feelings for him and keep seeing him because of the hope no it will not happen and will hurt you more. But if you agree on keeping casual, can ot judge it is your life. Mostly in this kind of relationship girls get hurt more.
Not necessarily- if that's what you want and the two of you are clear about what you're doing, I don't see a problem. If there isn't clarity and one of you is getting emotionally attached or (figuratively) whipped, and is disatissfied, there's a problem.
Don´t think in such categories. Do what you like. As long as you both feel comfortable with it, anything is okay.
If your both single, then I see nothing wrong with it. If your both in relationships, then that's a HUGE NO NO!!
Not if you both consent, and don't feel bad about it afterwards.
No , it could be a way of getting back together...
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