There is a Taylor Swift song (sorry 
) which sums this up spectacularly well, "tolerate it". She describes all the nice things she does for her man who she sees as older and wiser and looks up to, but while she adores him and goes out of her way to do nice things for him, he tolerates her.
That's not right - the admiration and wanting to make each other happy should go both ways, especially in the early stages of a relationship.
Then the other one is lack of respect for boundaries. This is hard to spot if you're a people pleaser, but try to notice how he reacts if you ever express any kind of preference or make any request - does he accept it and respect it, or does he turn it around and override it? This can be subtle, some people do it in a jokey/mocking way, some people do it in an emotional blackmail kind of way, some people are adept at somehow turning it around to make you feel like you were being unreasonable to even say anything or have that preference in the first place. Some people won't address it in that interaction but will quietly store it up and throw it at you in an argument later.
You can even sort of test this in a harmless way - see if you can find a small request to make which would inconvenience him slightly, and notice how he reacts to it. For example, say "Could you please open the window?"
But yes, unbalanced admiration towards each other, and a lack of respect for boundaries are the two underlying signs of an unhealthy/controlling relationship IME. Most red flags are noticing little tells of these things. Seeing the relationship as transactional as well. Not just doing things for each other because you want to and it's nice to see your gf/bf happy, but because it is like little deposits into a bank which you intend to withdraw from later - very unhealthy relationship mindset.