I don't know what to do. Can someone please help me?

my ex broke up with me 5 months ago. We dated 4 months. We were so happy together. I feel like I ruined the relationship by joking about the future and marriage even though we are not ready for that. I might of said other things she didn't like. We work together and I am being really nice to her. I want her back. I was thinking of texting her I am sorry. I don't know if she would respond to that. I want her back in my life. I don't know if she is over th break up but she is not the same since.
I don't know what to do. Can someone please help me?
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