Why did he make a fake account?

[Rachel]

Ok, so my ex and I were in a LDR (he lives in the Netherlands), I broke up with him last month because he was really really friendly with his ex/best friend, and after that he harassed me. Like big time harassment. We both used this pen pal website (It's how we met) and I've made a lot of friends my age while on it after the break up. This one person who added me seemed cool. We talked for a week or so, but today I found out it was my ex. He impersonated a girl on the site. I told him nicely that I never wanted to talk to him again in the last email I wrote him weeks ago. And since then I've just been ignoring him.

But why did he make a fake account just to talk to me? After knowing that he did make a fake account I started to shake really bad. I don't know what to do...