Felt like crying

Today i was doing some shopping and saw the one of the people who bought my mums old house, saying i had a letter there and could i come and pick it up, (not sure why I'm still getting letters sent there mind you).

I have been to my old house quite a few times but today going there hit me, for some reason all these memories came back of when i was living there, how i used to go in the back door and imagining my old dog waiting for me in the front yard, how my parents spent all this money on the house and i was thinking how these people shouldn't be living in this house, how it is my house, not sure why these thoughts hit me, but i feel sad now....