I am wondering if we have read the same thread swing
The OP did not 'choose' to change her career, she did so as a result of ill-health and having discussed it with her DP who said he would support her, if I understand her correctly.
Despite this, he has not supported her and she still pays half the household costs. Part of the problem is that, despite setting up a new business on the understanding of support, the OP is contributing equally to costs, whilst her DP is saving money. I am sure she said she had £11 left over after doing this and he has thousands in the bank. Forget holidays, this is not an equal partnership. This is a man who is gaining from the OP contributing to half the living costs he would presumably half to pay himself were he living in the same way himself (whether he would live that way or not is another matter, ditto OP). He is not supporting her financially already, he is keeping his money to himself.
At the same time, in the whole of their relationship, the DP has not sorted out his contact legally.
I don't see what is hard to understand here, but to be fair, freerunner herself is focusing on the holiday.
Mama234 is right, freerunner you could do much better partner wise and indeed on your own too.