Girls think that I’m a player?

Hi everyone, I want to ask, when I was at high school, I had a big problems with approaching and making any contacts with women.
After graduating, I changed that rapidly, becoming more interested in how women think, how to flirt with them, etc.
at the moment I have no problem with contacting / approaching them and going on a dates, but I still hear the same thing - they tell me, that they like me, but can’t trust me, because I understand them too much and they think that I'm a player and just want to sleep with them.
And thats how it usually ends.
But the only thing I'm looking for is a long-term relationship. I absolutely do not understand how to behave in this situation. Thank you in advance for your time and opinions.
Girls think that I’m a player?
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