1 I don't want to play with you anymore.
2 It could be because of different reasons such as personal preference, lack of interest or time, or other commitments.
3 It's important to communicate your feelings clearly and respectfully to the other person.
I won't play with you。朋友，英语很简单的，首先就是这个是意愿词，用would或won't，表达愿意或者不愿意，然后根据意思翻译就好了。