Help 😩

So I've been dating this guy for almost 8 months and I feel like it's not going anywhere. Mainly on his part because he doesn't communicate well or express his self. He's a Sagittarius and he's the most complicated guy I've met. I wanna talk to him about it and I think I'm gonna do it today. Have anybody had problems with a Sagittarius or is it just him lol I believe he thinks everything is great when it's not.