It sounds as if in your previous relationship you were making your friend feel uncomfortable but you didn't realise you were doing it. It is important that this does not happen again because it can damage a friendship so it might be good to take the teacher's advice and take things slowly, especially if you find it hard to realise when you are being a bit "over-the-top" with claims on the other person's time. Sometimes, especially when you are young, it is hard to know when a person is beginning to feel a bit pressurised by our constant presence, so it is better to make sure the other person gets enough space and that you don't crowd them. I would say, take the teacher's advice, because the teachers may know more about previous situations than you do yourself, and the teachers may be in the best position to make thing work for you and for your friends. i do hope you can get this sorted out. Good luck.