What is the best decision to take over this situation?

I used to work with my girlfriend in the same place , she is my team leader , there is a guy in our team whom she treats very special and gives most of the time and attention , i know it is her duty but i get so jealous of this , it got me so angry when she once mentioned that she wants me to be decent like he is , one time we were all eating and she gave him food directly to his mouth. She gave me a feeling that i do not exist and she has no respect for me , it drove me crazy to the point that i feel so angry and bitter , i decided to break up with her because she hurt my feelings? Is this the right thing to do?
What is the best decision to take over this situation?
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