Boundaries and kids

I feel like I'm always trying to do what's best for the kids. Unfortunately since I'm the only one doing this I often get taken advantage of at walked on by my ex. For example 3 weeks ago I was invited to dinner and it would have made me late so I texted ex to see if he minded. He said he ha plans so I didn't go. Last Friday I had a horrible migraine (1st one in 2 years) and he was off for 5 days between jobs. I texted and asked if he could keep the kids. No response and he dropped them off so he could go hiking. Then Sunday he texts me and says he has a date can I pick the kids up at 5 instead of 6. I did. No problem. Tuesday I had a court hearing at 3 and our youngest woke up vomiting. I texted him to ask if he could help out as I can't leave a sick kid with a sitter. No response. Then Wednesday night at 9:30 pm he texts me saying how he has to go into work now at 7:45 and doesn't know how he's going to her the kids to school. I texted back an d said "I'm sorry, hope you figure it out". He comes back texting all sorts of horrible things about how I'm being mean because he has a girlfriend blah blah blah. I explained that because his help is never reciprocated I will no longer be bending over backwards for him. Especially when he knew all week that this would be the case. Long story short I caved because I felt guilty. I know doing more than he deserves and I need to art some boundaries. What is appropriate to help with and what isn't? Where do you draw the line?

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