Relationship Help!

Ok so my boyfriend is currently in officer training for the army right now and he will be done at the end of October. Before he left we had already talked about moving in and getting married at the end of the semester (December) and our parents are all for it and support us 100%. But this long distance is kind of getting to him (and me) and he really wants me to drop my two classes and come live with him now ( the training he is not super prestigious and they allow couples to stay in the housing together) I am terrified of dropping my classes even though they are pointless and I don't need them but my dad is so happy I'm keeping myself busy. My boyfriend said if I wanted to get married sooner then I'd have to come live with him now but if I wait until December then he is going to push off our engagement until later. He said that cause he said he wants more face to face time before he decides when he want to propose.  I do want to get married sooner because I don't want give up everything I have here to go shack with someone that doesn't want to get married. So does his logic make sense? Should I move now? Or is he being manipulative?