How to ask guy to come over and watch a movie?

We're not going out, but last semester we went to a girl-ask-guy event, on Valentines day he asked me to our "prom" (last weekend) and the other day he asked me to go swing dancing (not really a date since a friend of his is taking us, but still).

I own his favorite movie on VHS but haven't seen it. I was tempted, but I thought it'd be nicer to see it with him. I have a TV/VCR in my dorm room so I figured I could ask him to see it this Sunday (when boys are allowed if you keep the door open).

I just don't want him to think I'm being too forward. I don't want to invite anyone else, but I do recall a girl asking him to hang out and him saying although they had in the past, he had a new rule not to be alone with a girl that wasn't his girlfriend. Although my friends think he said it for my benefit and the girl said its because he didn't want to be alone with her, I don't want him to think "she knows she's not my girlfriend, right?" when I ask or think that I am ignoring his rule.