Relationship issues 😭

Well, I guess I can just start from the begginging. If anyone truly cares enough to read.. My boyfriend and I have been together since 3.14.15 (not long). He noticed that on 05.28.15 I commented on some guys video post that was shared. (You know those famous people via Facebook) I commented "cute butt! 😍 " it one of those posts that have a million different responses and over 90% are girls posting the same comment about the abs or the eyes or his body...  Anyway there was this post of this "singer" guy who claims to be super famous and my friend reposted it and I commented about the singing and someone said that I wouldn't say that to the guy so I messaged him "you're sexy but a terrible singer, stick with modeling" and he messaged back and called me a C-nt. I told my boyfriend and he was so angry about the "you're sexy" comment that he completely shut down on me and is super angry. 
My question I suppose is... Is it ok in your opinion to say those comments on social media to complete strangers that you know you'll never meet or even "famous people" ??

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