Does this mean he likes me

So basically I’m not sure if this guy in my class likes me and these are the clues pls tell me what do you think.

1. He is the type of guy who goes out a lot and stuff and every time someone sends him a message he doesn’t respond very quickly for example one of my girlfriends sent him a message and he didn’t respond for a few days. But every time I send him a message he responds almost immediately ( and my friends think this means something idk)

2. He remembers my interests. He remembered that I like math . Since he is in school Parlament he knows about the resent school events. And once their was this math thing. He approached me and said something along the lines I know you like math … there is this event happening.

3. He always greets me first. He is always the first one to say hi ( I’m not sure if this means something or is he just polite)

4. He invited me a few times to sit next to him. When his and my desk friend didn’t come to school

5. He talked to me about his family and how they are rich ( idk about this but my friends says it means something)

So yeah overall my question is do these things actually mean something or not