Please tell why ?

So it’s 7 Pm on a long weekend here . I’m a stay at home mom . Today i cleaned my house baked did laundry , my bf went to his brothers said okay I’ll be home by dinner , leaving me with everything so I sent my 4 year old with him to give me a break, I decided to go hangout with friends and family , I get a text .....(sons name) wants to know when your coming home . I never go out on my own. I feel bad for going out but I need my time to once in a while .. am I doing wrong ?