My son missed mothers day

My son is 21. Sunday he texted early to wish me a happy mothers day. Later in the day, I asked him if he wanted to join us for dinner. He said he did not think so , he was at his girlfriends grandmothers house and he did not drive. He texted me at 11:26pm (i go to be bed 9-10pm) . Long text about me being the best mom ever and that he would be home monday after work. He bought me a card and roses that I found monday morning.
I managed my brain sunday and did not make his abscence mean anything. Now I find myself feeling like I should tell him that on mothers day he should visit his mom .
He lives in my home with his dog. I have no desire to go out of my way to care for his dog like I have done for the past 2 months since he moved home. I feel so numb .
My thoughts. He can do better. Disappointed. I want to tell him how he should behave. Suspect this will cause a rift in our relationship.
if I would have raised him better he would not behave like this.
Guilty and self indulgent
I take responsibilty for his action
Parent child relationship perpetuated
Help me figure this out.