OP - this was your question in your OP - "What do I do? Help me. My head is a mess and I'm extremely hormonal being pp".
People have given you that help that you asked for, and you have argued with everyone, minimised what your DP did and are making it clear that you don't have any worries.
Then you claim that you are leaving because MN is well known for this... ie a pile on to the OP.
In this case though, there is no pile on, just a lot of concerned people, worried about the safety of your DC .
However, there is nothing that anyone here can do to protect your DC. That lies in your hands alone. You need to issue DP with an ultimatum, either he gets counselling for his issues, so that they go away, or he leaves.
He is the adult in the situation and should never respond in an angry way.
When I did parenting classes many years ago, to deal with a difficult child, they said if you shout, if you retaliate, then you have lost control, you have crossed the line, you are the adult and you need to remain so and not drop to the level of the child...
DP needs counselling and parenting classes. If you split up, then he should not have access to the DC on his own, so you need to raise this now so that they can be protected.