If you are getting your clothes I would either text him or his mum asking to have them ready for you outside so that way you don't have to go in and see him.
I think if you went round to collect them and went in you'd actually beg him not to end things and it could get abit messy.
OR
Have your sister or friend to go and collect them for you.
I'd advise you to just cut contact now, he's not interested in you in the slightest, he's proven that.
Says it all by the fact after he knew you'd contacted his mum, he didn't even answer your phone calls, surely ( clear you dont) see that he doesn't want to talk to you
Some guys unfortunately do this after a few weeks of having an amazing time, I've already said I've had this happen a few times
The more you try and contact the more you'll come across as desperate and your clinging onto any tiny glimmer of hope - there is none
Do yourself a favour and accept that it's run its course after 6 weeks and be thankful that this didn't last longer
I have now read your other threads and it sounds nearly identical, you might not see it and put it all on him being the one who said " I love you" first and talks about the future, but it's scarily similar to your last relationship and that's very telling
Sort out someone to collect your clothes or if you can't get them left outside his house and be done with it