I told his girlfriend off?

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Ok so I dated this guy 2 1/2 years ago when I was 14 he was almost 18. I'm 16 now. I lost my virginity to him a month into the relationship and I was his first on the second date. Now he is dating another girl they have been dating 10 months she's 19 and he's 20. so I wrote her on Facebook "hey slut, you like his penis in you don't you? Haha whore you just love to spread your legs for him don't you?" "you must be a real winner dating him." i heard she got so embarrassed she couldn't face anyone at her church. haha I thought it was so funny. she doesn't know me and him had sex so she cant say anything lol. No I'm not jealous I dated another guy last year so I have moved on. what do you think of all this?