AITA for not being too sure on giving my boyfriend money?

I (16F) have been with my boyfriend, let’s call him Jeff (42M) for three months now. Things have been great for the most part, but things have gone downhill over the last 2 months. He’s had a real bad temper since he lost his job as a postal worker after driving a van whilst drunk (which is a false allegation), meaning he has almost no money after paying child support for his 3 kids (25F, 15M, 8F). Recently he got mad at me for refusing to see him because I was studying for an upcoming exam, which he told me “the only thing you need to examine is this dick”. He also pushed my brother (7M) off his bike and started ramming it into a wall when he cried and asked for it back. On two occasions he has threatened to kill my whole family and burn our house down after my dad (41M) said that smoking at the dinner table was not allowed and wearing a t shirt with “daddy’s little slut” with an arrow pointing at my aunt (I accidentally sat on the wrong side of him) with a cigarette burn in it was not appropriate.

Recently, he has found an online training course for something which he is really eager to start, but will cost a lot of money (it also only takes dogecoin too??). He doesn’t have the funds to buy it, so he called me asking for me to spot the money. I told him that it’s 2am and I’m trying to sleep, and we could discuss it tomorrow. He flew off the handle and said some really hurtful things to me and that his daughter (25F) hates me.

AITA for being reluctant to give him money there and then?