Baby daddy and his new fiancé

So me and my ex husband have a 6 year old together. We have been divorced going on 4 years now. Last year he found this girl on tinder and I’m assuming now with the circumstances they really hit it off 😂 well they knew each other for 3 months and she ended up getting pregnant by my ex. Well when I found out I told him congrats and was happy my son would actually have a sibling. So I have never had any issues with this girl, I met her a couple times and got along with her. She was even there for my sons first day of school. She treats my son like he’s her own. But while she was pregnant (I’m thinking like 5 months) my bf was at work and his heart was beating out of his chest and he had to go to the hospital(over 200 beats a min) so he left his car at the fire station. He also found out that he would have to have some kind of heart surgery the next day. So he asked me if there was any way I could get a ride to the fire station to pick up his car so it wasn’t just sitting there. I called my ex husband bc normally he would help me out if I was in a pickle like that and plus he lived like 5 mins away. Well he told me that when he was done eating he would take me. I told him he could bring his gf(she was his gf at that time, they JUST got engaged) and our son(since he had him that week). I told him this So it would make his gf more comfortable. Well he calls me back 10 mins later and tells me its probably not a good idea for him to take me. I just said ok and I asked a friend of mine. The next day when I’m at the hospital and my bf just got surgery I get a text from my ex saying I can’t be asking him for favors like that. That I AM going to ruin his relationship! Not even one min later his gf texted me cussing me out. Calling me a whore, telling me I’m his ex wife and we shouldn’t have any communication what’s so ever unless it’s strictly about our child. She also said that I probably sit at home and cry bc her life is perfect and I’m jealous of it. To stay away from her family, MY SON IS MY FAMILY!! You would have thought I asked my ex out on a date. Also I pay my husband money for our son (not court ordered) and I don’t pay him on a specific date either, well she’s telling me extended day for our sons school is due at a certain day and I need to pay it. I could not believe this girl! She cussed me out for 2 days for asking him for a ride to get his car. Also she’s cussed me out about conversations that I have had with my ex concerning our child. I don’t know what to do besides block her and ignore her. Does anyone think that she is out of line for freaking out over something so dumb and petty? I swear this girl has problems.