Hi, this is my first post in this forum (despite started reading the masterpiece Psychological Self-Help 4 years ago). I am interested in gathering you guys' opinions on the relationship passion and love (i.e. love between a couple). To be more specific, is passion a necessary part of love?

Just in case anyone wonders why I am asking. I and my girlfriend are currently having a crisis in our 3-year relationship (btw, we are in our mid-20's). She says that she doesn't have the passion for me anymore despite she thinks she would never find someone who treat her better than I do. According to her, she is a sexual person but has lost interest in having sex with me since one year ago after we re-united from a short-term break up (I was the one who proposed the break up and I guessed I said things which hurt her). She also mentioned about not enjoy spending time with me together anymore. Nonetheless, she would miss me if she doesn't talk to me for a couple of days. So is the love still there or is it not? To be honest, I am quite devastated since I really have done my best to treat her well all the way right from the start (despite the way I used to talk to her was too assertive which she didn't like but I have changed since she told me this problem two weeks ago).