Listen, you're not doing yourself any good whatsoever in dwelling on whether or not it was a date. the question you should be asking yourself is do you trust him? if you do then let this go, cry and scream and shout to get it all out of your system once and for all if needs be. If this is the case, let him know how you feel. Sit him down and say "i need to let you know how you made me feel about this, but afer this i promise i won't bring it up again, as i know it doesnt mean anything [only if you do know that] and that you love me... blahblahblah" that way he knows how much it hurt you and it would make such a big impact that he won't do it again.
stop thinking of it as a date. start thinking of why he did it. If you want things to go back to "ways things were" before you started feeling all insecure and shouting at him for nothing then you NEED to stp thinking of it like that.
Keep thinking this way, you're going to start resenting him (whilst loving him) for little things and there'll be a big massive wedge driven betwen the pair of you because he will pick up on the vibes you're sending out, and as you'll be mulling over it you won't want to necessarily talk about it and then he'll feel he can't talk to you.... you see where this is going?
God knows, i know what it feels like " for things to go back to normal" and i've learnt that being withdrawn and somber and angry and insecure just doesnt work. i makes your life hell. it makes his miserable. and then things get pushed to breaking point.
one question though, does your boyfriend know you pulled on that night?