His mum atleast, has to know what's been going on. With you two spending so much time together etc, he's got to have filled her in
In all honesty, it's all weird !
You're adamant you're going there, so good luck. I still believe doing this is going to hit you harder, but you clearly arnt bothered by that 
So long as you know you're going to get nothing more than your clothes, but please please please, I can't stress it enough, delete and block all of his family.
There's no need whatsoever now to have any contact with them at all
Have to point out that it says something he's not even been arsed to ask for his stuff back from yours. But I think you should take all his stuff and drop it off there, that way he never has any need to try and contact you either
You've not I don't think, said anything and dropping his stuff back, but please do that,do not have anything where anyone can get Intouch with you
After you leave that doorstep it's done - end of
It hurts, but you need to accept you're never going to get answers from him, and no matter what he says anyway it's not really going to make a difference. Even if he turned round and said " ok I'll be honest, I did rush it, but you made me back off and it didn't feel right " or " I just realised that I'm just not that into you " you'll feel worse anyway, so you can close that book on that
6 weeks is such a short time in the grand scheme of things, you have every right to be upset but don't prolong it anymore!
Do the pick up and then shut it down now, you're the one who's hurting - not him, not his mum or sister and if you keep looking for or finding reasons then that's down to you
Like I said good luck