Not getting the help I expected

So I'll start off by saying I do love my husband and we've been together 6 years. My husband has a daughter from a previous relationship and raved about how he took care of her all the time and woke up every 2 hours with her (saying baby mom was lazy). Now I know my husband exaggerates so I'm sure he helped but not sure to what extent.

Now since our son has been born, he hardly ever helps. He's maybe changed 10 diapers in 2 months. He only helps if I ask him to or when I'm in literal tears from being overwhelmed (baby is very fussy). When I say I just need a break sometimes, he claims so does he since he works full time and overtime. Mind you I'm going back to work full time myself in a couple weeks. He will hold the baby maybe for five minutes before handing him back. And he's only gotten up with him twice at night after I woke him up frustrated. And when I try to communicate that I need help, he says I should call his mom or mine. 🙄

I guess I'm just sad that he doesn't want to help or maybe I had too high of expectations. Now I'm really doubting he helped as much as he claims with his first. And makes me wonder what he tells people now. And with covid, post partum has been very isolating in addition to doing EVERYTHING for the baby myself.

Thank you for listening to me vent.