What does it mean when 17 year old boyfriend wants u to meet his mom

We’ve been together for a year and half and I met his mom like 3 times . He tells me she really likes me and she wants a dinner with me to get to know me more.He always tells me he wants to marry me and have babies with me. We’re in high school . Is this serious? Or no? When we r intimate we can go for 5 hours kissing touching and taking clothes off. But when I suck his dick for like 5-10 minutes he hasn’t came. I’ve really been trying to make him cum but he hasn’t. Always saying he’s close. Do I turn him off? Do I turn him on?