Help me report this dude

Me and my friend were friends with this guy and was very nice, but he started to chat with my friend and started out very weird with him calling my friend "cute". He then asked my friend how old he was and when my friend said 14 the guy said "I'm 21, hope that's not bad". Now, he's unfriended us and is trying to stalk us by following us. So please help mass report him. he also asked for his discord.