My baby father is mad at me... did I do anything wrong?

Im a full time mother of two kids... a two year old and a 4 month old. Me and the father are not living together... he lives 1 hour and 30 min away from us. My two year old had been getting into stuff and she's been having tantrums. I was on the phone with my kids father and I caught my two year old with a cap from the water bottle in her mouth. I took it out her mouth and she started yelling and crying. My kids father says," She doesn't cry when she's around me." I flipped out on him. Everytime she has a tantrum he gets upset with me because he think I'm doing something bad to her. Like I'm a bad mother. I broke down because I'm doing a lot by myself and I know I'm a good mother.

My baby father is mad at me... did I do anything wrong?
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