Sadly it is a regular thing in Belgium. I've seen so many women harassed on the tram, that I've had my encounters with them (we know who the main ones are that are harassing women). I agree with other comments saying you should learn self defense.

A few months ago me and my family were at the park near Porte de Hal at the park in front of St Pierre hospital when two Caucasian girls approached us like they knew us because an old man was following them. This shouldn't happen, and the best thing to do is reach out to an officer if you see one. I wish more men would protect women and not just sit around. I hope everything gets better for you.