My partner and I have been together for 5 years. I have a daughter from a previous relationship who is six years old, I have a very amicable relationship with her dad and his partner who is great with her. Last night I was waiting for her dad to pick my daughter up, due to his job this can be anytime on a Friday when he has finished work. He has her for a weekend, every other week. There has been the odd occasion in which he has gone away at the last minute on his weekend socially and my daughter hasn't seen him. and then in the next sentence complains about how lucky I am to have more time with our daughter (this is relevant).
My partner has been in my daughters life for three years and is great with her. He does everything he can for her. He sits and builds with her, takes her to and from her activities, school work etc, never had any concerns.
Last night we were waiting for her dad to pick my daughter up when he he mumbled along the lines of 'if he so bothered about time with you, he would have been here by now'. My daughter thankfully didn't hear but I had. I asked him to repeat what he said after I closed the door on my daughter and he said I am sorry I shouldn't have said that it was out of order. I said that he was bang out of order and what if my daughter had heard that. He told me to leave it and that it was an obvious accident. So carried on as normal, until her dad picked her up shortly after 19.00. I haven't really spoken to him since as I can't shake the fact that he said that. He knows how I feel and we have discussed this from the beginning, that I cannot tolerate behaviour that will impact my daughter. That her daddy and I are not together but there is no animosity and i don't ever want my daughter thinking there is.
For context, he has a teenage daughter and I said to him last night despite all of the issues from his ex partner, I could not imagine making digs in front of his daughter. To me the children's welfare should first and foremost. He expects me to drop it as he didn't mean it to come out and that I am overreacting. But I can't help thinking about it and have not really spoken to him. AIBU to be upset ?