Baby doesn't cry when he wakes up

I think I might have accidentally ferberized my baby. He is 3 months old and has stopped crying when he wakes up in the morning. He sleeps through the night (i hate it, it gives me so much anxiety). A few weeks ago my husband woke me up when he was getting up to go to work because the baby was crying and I didn't wake up from it. His bed is pressed up against ours so It's not because I couldn't hear him. I have been alone with him pretty much 24/7 since he was born and am exhausted to the point of not even hearing my husbands alarms in the morning anymore. And I have PPD so I can't fall asleep at night. I think it wasn't the first or last time that has happened and i am so heartbroken thinking my baby was crying and no one picked him up. My husband woke up to his cries the first few days after he was born but hasn't since. I dont know what to do. I feel like an awful mother and that I probably shouldn't have had a baby if I cant even comfort him.

Adding this incase it is important. He entertains himself when he is awake by playing with his hands and looking up at the ceiling. he finds the ceiling hilarious for some reason.

Any advice on how i can start waking up again? Also does he think we dont love him anymore? What do I do?