What does it mean when the only reason they give for breaking up with you is that they ‘just lost feelings for you’ with no other supporting reason?

Boyfriend and I were together for 1.5 years. All was going very well, he is a great person and we had a dream relationship that was very healthy. We go to the same college and all. He was my best friend and we will still remain to be friends because we care about each other greatly. He broke up with me at the beginning of the month out of the blue saying that he ‘lost feelings for me’ and that I ‘did nothing wrong and am a perfect partner but it just wasn’t the same anymore’ and not much more reasoning since. I’ve been working hard to accept this because ultimately want him to be happy, but I did so much for him. I really thought I had found my dream person in life after having been through so much pain in past abusive relationships. How do you move forward knowing that your best wasn’t good enough for somebody? He was such a genuine soul and I wish I knew more about why he chose to end things. He’s very firm on not wanting to get back together and I accept this but it’s so hard, we had a beautiful relationship and I just wish I knew more about his reasoning in the end :/ I feel so broken now over the holidays while I feel he is just living life as normal with his huge family and friend group (at least that’s how he is acting) while I do not have many people in my life. It’s rough out here, sending love to all of us during these times.