Besides being lazy it's pretty obvious Catelynn feels guilty about Carly
She can't accept the fact that she's made so much money off of this show yet she gave up her daughter because at the time she and her mother were bouncing from house to house on section 8. It's like her reality is such a contrast to how she grew up that she feels like she gave up her fresh and blood because her whole world aka Tyler convinced her too. Look at Carly's birth, you could tell the way Catelynn held her and cried she second guessed her decision.
When I think back on 16 and pregnant, I completely get it. They were 15 year olds having a baby. Catelynn was in a situation where she was living with her addict of a mother and her step dad, another alcoholic was also the father to her boyfriend. It was chaos all around her and Tyler didn't want to add to that. Though, Tyler's mother is pretty stable. Let's say they didn't give up Carly, I don't see why it would have been wrong for the baby to live with Tyler. Not only that, the little money they got from the show, they would able to get an apartment (remember how happy they were when they got that place?) , and he got her a cute engagement ring. It wasn't perfect but it was manageable. They were too invested in the crap their parents were putting them through.
Now Catelynn can't go through a day without thinking about the daughter she gave up and you can see it's eating her up. She has a fat bank account for doing nothing. She can buy a house with a mortgage or with cash at just 23 years old and she's like why the hell did I give up my daughter if I can afford all of this? What do you think she's thinking about when she's sitting on the rocks by the water with a joint in her hand? Not just how the sky is blue but how she's missing out on everything with Carly. Carly probably looks exactly like Nova and being around Nova everyday reminds her of what could have been.
Tyler has dealt with this grief differently. He doesn't mind her being adopted but hates the fact that he's not in control sort of speak. It's like yeah you can adopt her but what's wrong me dropping by every once and while? Etc. Plus, the birth of Nova has eased his grief a little bit. It's like a kid with a toy. He missed his toy that he lost but he got another one so he's content. Catelynn on the other hand wants her new toy to play with her old one. Like in Toy Story. No matter how cool and awesome Buzz Lightyear was Andy would never get rid of Woody and it would always hurt him whenever he went missing.
"I never hear you speak and when you do you apologize for saving me?"