What does girls truly want from a guy, being too nice is bad, being to bad is also bad its hard to balance and to be honest balance doesn't exist?

My last three relationships only lasted about 5 to 6 months. Am I trying too hard. How do I tell girl is into you?
What does girls truly want from a guy, being too nice is bad, being to bad is also bad its hard to balance and to be honest balance doesn't exist?
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