You raise a very good point, good men exist across the board of course, but what you may have encountered is the idea of familiarity with white men.
Meaning white men are accustomed to being around white women, usually. They interact with them on a daily basis and so it is easy for them to take white women for granted since they are always exposed to them.
I have heard some black women make the claim that "some brothas treat white women better than black women" and some black guys state that black women who date white men will even switch up and be less confrontational, argumentative and on an independent woman trip.
So this all goes back to appreciating, treasuring and valuing a partner you are with, I feel this may play a role in why you enjoy the black man that you are with.
He makes you feel like a loved woman and what person wouldn't want that. The cool thing is you recognize those qualities in him as a man and want to reciprocate them as well.
As a black man when I love a woman she is going to hear it with deep emotional words, feel it with soft kisses and passionate intimacy and know it with my actions towards her (breakfast in bed, sunset on the beach, dinners at a quaint, cozy restaurant)
I'm all man, but have no problems expressing my romantic side and my emotions.