Yes. You need healthy boundaries.
Read about codependency.
You are indeed overbearing.
What you did, was put a "but" into your affection and appreciation for her. Example: You do a great job at work, I am proud of you. (You could have left it at that..you didn't here it comes) BUT you should go back to school to realize your potential. (Thus, she is not good enough. Let's do another. She wears work boots. You could say: "babe, do you want a foot rub?" (No, you just buy lotion for her dry feet. Thus, you never liked her feet.) You got the hair thing. It is in the words. Be kind. Think about her feelings. You'll know better next time.
It may have been. Of course, I can only comment and react to what I see from your question. We are only getting your side. There may have been underlying factors in her mind. Who knows?
It sounds like you were overbearing.
Sounds like a bit of a fabricated reason...
I've usually suspected, when I've found myself in similar circumstances, that there is some physical thing which they are dissatisfied with--but they won't tell me for fear of causing irreversible damage.
I see what you're saying. I think it's not quite what I was getting at I'm afraid. I meant (in some of my past post-relationships): I've worried it is me that is dissatisfying to her in a physical way. She doesn't want to tell me how she is dissatisfied with me, perhaps...
Maybe she is trying not to indicate to you something about you that dissatisfies her...? The thought is so sordid and cynical that I hate to mention it, and I know it is so only because it is a certain painful notion I fall victim to frequently. Unfortunately, though, I sometimes can't seem to figure out any other reason an ex breaking up with me could talk to me as coyly and manipulatively as I vaguely suspect them as having intentioned over our break-up's dialogue (I've never broken up with a girlfriend, interestingly)...