I do not hate people who are fans of my music. I do not hate children. That is crazy. I'm sorry to the mother and child that someone was assuming that you would do something, and if you felt uncomfortable that makes me really sad. You did not deserve that.
Plenty of people date others at the same time while things are casual, and making the assumption that this is a committed relationship can lead to miscommunication, as you have found out the hard way.
He thought Australia (we're in England) was at least two days in front of us, so he thought he could travel, watch the cricket, and call home to tell us the results and bet without losing. Took nearly an hour to explain his errors and the 24-hour clock.