Maintain your own life and goals. Don’t get lost in the other person. She’ll respect you more if you stay your course. If you have plans to go to the gym, and she calls you up wanting to do whatever… “sorry babe, I already have gym plans. But I’d like to see you later, are you free whatever time?”

Someone else in the comments said put the other person first. Bad advice. Especially for men. A woman admires a man who is faithful to his own life and goals first. It shows her that you are reliable, trustworthy, a man of your word, even if that word is a commitment to yourself (like going to the gym regularly.) Certainly you can make room in your life for her, but never put your own goals on hold for her.