Advice needed

I was in a very toxic relationship a few years ago, I was emotionally and financially abused by an ex partner, he used to take all my money from me and only give me money to go to the shop for him, Iv been in an extremely happy relationship to (my now) husband for 4 years but because the previous relationship was that toxic it’s left some scars, to this day I can not justify spending money on myself unless it’s something I need, I always end up spending money on everyone else, my husband has now noticed this and has given me some money to spend on myself, but at the moment I don’t need anything, my question is how do I break this habit? What do I buy if there’s nothing I need? I’m not a materialistic person, I enjoy feature comforts but I can live without them, so what do I buy? And how do I snap out of this habit? Thank you in advance