Dating sucks!!! advice would be great?

Guys mostly, if you are in a relationship what would make you feel so in love and ready to work it out one week and after an argument, you would break up with her and want noting to do with her anymore and tell her you do not feel the same anymore. This is happening to me and he has completely shut me out saying he’s done and does not love me like he thought he did.
Dating sucks!!! advice would be great?
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