I was in a situation where I began to feel like my friend was controlling me. He is male and though his words didn't say it, and he didn't act superior I got the feeling like his assistance was all based on his "superiority".
It's very hard to answer you directly here since I don;t know the friend or the situation but I must say; when a friend is always trying to tell you what to do or making you feel like your way is wrong then they are trying to control you.
On the other hand I love a friend who can always tell me the truth; however if that friend is always telling me the negative truth then something is wrong. My friend should know when to say the truth and when to hold back.
Your instincts will come in handy here. If for any reason you start to feel that your friend has ulterior motives that's the time you should start assessing your friendship.
For me a friend is closer than a sibling. i should be able to tell him/her anything and not feel like they will use it against me. I should feel comfortable with my friend and not feel under his/her control. My friend allows me freedom to do what I want but will give advice, not commands.
I look for signs of a controlling friend such as:
"I told you to forget that guy!" this is a friend trying to control you.
"I know it's hard to forget him but he may hurt you again." This is a friend who is on your side but not trying to control the situation.