I said this to my girlfriend, what do you think?

I'm a bit jealous and possesive in our relationship. Last week in our country, a guy murdered his girlfriend for rejecting his proposal. After that my girlfriend frequently send me news and memes related to that and says "you're just like that guy and you'll kill me". She repeated this 3,4 times.

Today, I got fed up and said "I don't believe 100% that we'll be together for lifelong. I don't care even if you leave me right now. I'll live a happy life ". She blocked me. We are really in beautiful 3 year serious relationship. What do you think.. who should apologise?

I said this to my girlfriend, what do you think?
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