From an objective observer's point of view -
trust is earned. He must prove to you that this was a one time incident and will remain as such. Love is also proven. Because you love him, would you do the same thing to him? Most likely you would not. There is also an issue here that he had said it was "nothing" and provided an excuse - being in a bad space hence, seeking distractions. A person can be in a bad space and not use this sort of behavior and the incident is not nothing. It is a major red flag.
Another red flag is the you are worried that he will act out again.
Usually past behavior is a good predictor of future behavior.
Never trust words but consistent actions.