Dream of girlfriend, shopping

I was in my own house an mum was in the kitchen but down in this back room which in my head was my exes house was my ex his mum an his new girlfriend which I didnt realise till the end of the dream and they were leaving to go shopping an i was ease dropping an as soon as I heard a noise I bolted to the room near the front door hid under the bed an watched them leave but only saw their feet walking out the door from under the bed.