What should i do ? (ex relationship)

Me and my ex split up 3 months ago after I had miscarriage iv always blamed my self for the relationship ending as I feel if I didn’t miscarriage we would still be together. And be a family. since then we have been sleeping together still but now I feel like he’s distancing himself from me.

Anyways some of his stuff like a few clothes and toothbrush etc is still at mine and he’s still got a key to mine he’s not asked for any of it and he’s not give me my key back

I don’t know what’s going on I know I should move on but I can’t I do love him plus I have to see him all the time due to work and mutual friends

What should I do