I hope my children would be able to tell me if they were finding the way I was trying to communicate with them, or what I seemed to be asking of them deeply uncomfortable or upsetting. In fact, I know they would. And I would respect that, and look at why what I was saying and doing was making them feel like that.
My children are 13 and 15. They have been brought up to be respectful - and in turn to know and believe they have the right be treated in a respectful manner - and that includes by their parents too.
OP is obviously very stressed, upset, and hurt. She is seeking comfort in the wrong place. It is not her son's place to soothe her stress, upset, and hurt. He is also affected by his parents divorce, upset, stressed, and hurt. She needs to look elsewhere for that kind of support, whether by having professional counselling, looking to her peer group family or above (her siblings or parents), or her friends. Not her child who has loyalty and feelings to both his parents. He shouldn't be feeling any more asked to choose or stuck in the middle than he already is.
OP doesn't have to give her son money for things she doesn't want to. I would suggest it would be far better not to give, than to give with strings, bitterness and reproach.
If I were OP, I'd be wanting to do as much as I could to ensure there wasn't permanent damage to the relationship between myself and my child in this extremely turbulent period - for them both.