I know I'm being unreasonable but hear me out. I've been the full time parent since me and DA dad split up when he was 2. DS goes to dad every other weekend and half holidays. Over the years child maintenance payments have varied from his dad paying nothing on the beginning to then me getting some CMA. The first years was £120, it went up to £300 for a year then back down to £120, there was two years I was getting nothing and some years of around £100. Currently it's £55. From secondary school, DS will be living with his dad most of the week so I'll be liable for child maintenance and I'm sure he will claim from me. I've just done a calculation and it's worked out I'll have to pay £450 p/m. I feel really resentful by this because I'll pay it with no drama but I had to struggle along for 8 years with no help with anything other than the CMA amount.
I need to come to terms with this and just accept it's for my son but it's really pissing me off. I had a convo with my partner about this and he thinks it's only fair as I claimed against my ex which has annoyed me even more.
Do you think I'm being unreasonable to feel like this?