How do you find out what a man needs without directly asking him?

I think my last 2 relationships taught me in the importance of needs being met. I think I didn't meet my first boyfriends critical need which was to have peace. The reason we didn't have peace was just as much his fault and actually caused by his own carelessness. I only reacted to his behavior. But I've grown to understand that I could have handled things in a way that didn't take away his peace... only protected my own. I could have still left gracefully or just acted more mature. I didn't have to be weak all I had to do was maintain my dignity. My second boyfriend made no effort to meet my needs and again things turned sour due to the loss of love that started to occur. So this time I think I have a fresh start with a guy I really like. So far I have been trying to stay in a good light to him. I wouldn't be trying so hard if I didn't genuinely like him so I'm not faking just putting my best foot forward. I want him to associate the thought of me to positive emotions. The best way to do that is to meet his needs. He meets mine so far so I want to also meet his needs. My goal is to keep him incentivised to keep doing what I like. Basically I want him to stay motivated to do the right things in the relationship. So far he has told me in different ways that his needs are being met. I pay attention to small details to make sure I'm always aware of how he feels. but I understand that people are complex and need things that they may not speak about. I want to figure out what his needs are without directly asking him. I don't want him to think I'm trying to manipulate him into loving me' but I want to know what it takes to keep him happy. BUT I don't want him to know because I believe that people take you for granted in a heartbeat if they think they have you wrapped around their finger. My goal is to just maintain a healthy relationship.

How do you find out what a man needs without directly asking him?
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