Guy's Behavior

Guys, So this guy introduced me to his mom after giving so many mixed signals. What does this mean?

So here's the deal we were both in school, he's a year older than me. He was really nice and genuinely caring, not in any romantic way but he still made me feel cared about. The title says it well, mixed signals, he ghosted me that summer entirely. I felt horrible and dedicated myself to getting over it. I did but in August, all the feelings rushed back. Things were going well and back to normal, but he lost his dad in November. It was hard on him and he shut me out again, which I completely understand. After that, I found out that while he was giving me hope, he was talking to another girl. This girl and I were friends and it hurt, but she liked him so I had to be happy for her right? Later he ended up ghosting her too. The rest of the school year he started confusing me even more, he'd stare and smile, sometimes even go out of his way to talk to me or be near me. I even took his senior pictures and we spent all day together. At prom, he was with me all night and then at the after-party disappeared with another girl. After the graduation ceremony, he came up to me and asked for a picture, I thought he meant a selfie but, the next thing I know he calls his mom to take a picture of us. He introduced me to her and smiled and laughed the entire time. It felt like a scene from a movie where the guy introduces his girlfriend to his mom. The way she talked to me too, calling me pretty, asking me to visit them (They live in a city about 3 hours away). She took so many pictures and seemed so happy. Later that day he came to my house to say goodbye, he hugged his other friends that were here, completely skipping me, then looked in my eyes, smiled, and hugged me last. I was ready to leave this guy behind as a bad memory from my Sophomore and Junior years, but the fact he introduced me to his mom resonated with me in a way, I don't know about you but I don't introduce friends, much less if they're the opposite gender, to my parents. What does this mean? I'm so confused.
Guys, So this guy introduced me to his mom after giving so many mixed signals. What does this mean?
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