Love does break hearts, how to stay?

I have been in a relationship for the last 2 years and 9 months we have been seeing each other almost once every week, I'm madly in love with her and can't even think to be without her in the future. The thing I am not able to understand is that she's cool to use words like I'm done with you and sometimes it feels like we're not in a relationship she never let me give any honest regards to anything and every time I tell her that she should be more thankful, or less insecure leads us to fights where there is no resolution nor an ending. I really don't understand why I'm even giving any advice in the first place and also what I should do to make this relationship strong which I'm not feeling any.
Love does break hearts, how to stay?
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