Should I make my husband leave?

I would tell him to leave. Why would he just sleep in his truck outside during your "separation" and not find something a little more permanent? If this is some kind of immature "test" or game, that would be really weird & who is he to tell you that he wants nothing from you except sex. Time for you to take some control of this situation and tell him to pack up his truck and leave. What are you getting out of this and how long does he expect you to remain in limbo like this? Until he's willing to communicate in an adult manner and take steps to try to solve your problems, I wouldn't even contact him-allow him some time to really think about what he wants (and this gives you the chance to consider what you want from this marriage too). Good luck.