Is it a good thing that I look back at memories, and that they make me teary eye or cry?

Lately I’ve been looking back at some old memories and they make me cry or teary eyed. But I went to Disneyland with my girlfriend and her parents I had a great time. (we went 3 days ago) but I keep looking back at it, and I remember she kept telling me she was afraid of Haunted Mansion so I went with her on the ride to keep her safe, and comfort her. That was just one of the many memories. And there was a song playing when we were in the car going back to drop me off and me and her were holding hands and sleeping…Now I can’t listen to the song without getting teary eye. This is a good thing right?