'Well, if you had a husband/partner he'd be at work all day anyway, so it's not that different being on your own,........'
Or something similar.
I want to say - 'but you know somebody is coming home later in the day. Even if they only make you a cup of tea or a sandwich, someone is going to walk through the door. They're around at the weekend too. You surely get time to have a bath, drink a hot drink, may be peg the washing out without worrying about having to have eyes in the back of your head. You've got someone to talk to in the evening. Someone to perhaps make a feed or two in the evening. Someone to plan trips/nice things to do at the weekend'.
I'm a single Mum to a 13 week old baby - STBXH left a week before I found out I was pregnant.