This may get long winded so I do apologise.
Backstory, I am getting a divorce. Long story short, husband had an affair. We were together 9 years, the affair started whilst I was pregnant. I found out when our little boy was 5 months old.
He moved out to live with his parents 5 minutes away and I have stayed in the family home with our child as I had nowhere else to go. Since the split he has made life incedibly hard. I drafted a parenting plan (filled out a form I found on Google) to bring stability to our childs life and bring in some structure as I was constantly having to chase him regarding when he would see his son and make arrangements. We both agreed what would be in it.
He sees his son every 8 days and has him for 2 days/1 night. This is because he works 4 days on and 4 days off, and the arrnagement was done around this schedule. He has him for the last 2 days that he has off. So the days that he has him changes every week. I work 3 days a week (monday, thursday, and friday) as nursey only had space for him for 3 days.
Our sons nursery is nearish to where I work (around 10 mins away out of my way). My commute to work usually takes around 20 mins without the detour to nursery. So back when we were agreeing on schedules and arrangements, my ex asked if I could do him a favour. We did agree that as the non resident parent he would be incharge of drop offs/pick ups. However, he asked that when it falls that he has our son on a nursery day if I could drop him off/ pick him up from nursery for him. So if he was due to have him monday into tuesday, I would drop our son off at nursery for him the monday morning. He when then pick him up from nursery monday afternoon and have him overnight. Then he would drop him back off to me tuesday evening.
At the time I was happy to do the favour as I didn't want any fall out from saying no as he had been so difficult with so many other things it just wasn't worth the hassle. And doing it didn't put me out too much so I just let it go.
Fast forward to now. We are sorting out financials between us and it is not going well. I would have to start a whole new thread to properly go into how unreasoanble he's being and difficult.
The topic of me doing this favour for him came up, and it wasn't me who brought it up. Seeing as he brought it up I mentioned that I had been doing this favour for him and getting nothing in return. Not even a thank you or any acnowledgement of any kind. He snapped back that I should be doing this favour for him because he paid slightly more towards our household bills when we were a couple (he earned double what I did).
I did see red with this reply as it was one of many digs at me that he had made. I promptly replied that he was not entitled to favours from me. I was within my rights to withdraw said favour at any point, and if he wasn't going to be appreciative of it then I would no longer be doing it. (Due to the way the scedule has fallen this new arrangement woudn't kick in untill around 4 weeks from now so he has got sufficent notice).
He has replied that the arrangement will stay as it is and that he won't be agreeing to my demands.
So now I feel like I'm stuck between a rock and a hard place.
There is no reason why he can't pick his son up/ take him to nursery. He only has him on his days off. He has his own car and car seat. And he only lives 5 mins away from where we live. The drive to nursery is only an 18-20 minute drive with traffic.
He knows I have no choice but to carry on doing him this favour. Our son only goes to nursery on days I work so if he won't come and pick him up I'll have to take him. It just feels wrong that he gets his way and I'm left with no choice in the matter.
Should I just let it go or am I setting a bad president for the future? I don't know what to do/ say to him. I know in the grand scheme of things it's not that big of a deal but it's really wound me up.