too soon?

So...I had gotten with my boyfriend not all that long ago but we have been talking sense 11/25/16 so not long at all. We've been there for eachother, I helped him when he got sick and he is kinda doing the same for me.
My mom and I are about to move and he brought up the fact that he wanted his own place and he wanted me to move in with him. Now he's been staying with me for a while because he had left home for some odd reason. Everything felt good...in the beginning idk I was scared cause he was known to be a player. But he had deleted anyone and everyone that could be a threat to us and he has really been trying to work on himself. Granted I love him. And I would love to build a life with him...but is it too soon. He's 18 and I'm 17. Plus we haven't been together for a long while...another thing...my best friend/ex boyfriend has started talking to me again and I had cried silently as my boyfriend held me in his sleep...because I kept thinking about my ex. What do I do and why is this so hard...