Questions and losing weight and gaining muscle

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I am 5 3" and weight 118 pounds. I know diet should be better but I have been increasing my cardio. I am wondering if there's a thing of too much cardio a day. I work out5x a week with usually 45-50 mins of intense cardio and then weights. Does weights and cardio go well together. I'm looking for some tips or thoughts. I am trying to loose my stomach area which is hard. Am I doing the right thing?

Thank you:)