My ex

So like I was stalking my exes tiktik like I normally do and I was today years old when I found out he's dating some other bitch. I am so done with this shit, he lied so fucking hard when he said that he was obsessed as well. I don't even love him, I'm just purely obsessed with him. I need fucking help. Like why am I so obsessed with him? It's such a scary obsession.