My opinion but i’m sure Manley definitely has feelings for Mia still.
He gives her the hardest time otherwise, no matter who she’s with. I watch her youtube vids & in some q&a’s, she mentions that they can only co-parent properly when neither are in a relationship.
He gets back with Erin because clearly she’s a push over. He knows she’ll go back time & time again.
He still acts like he’s angry at Mia, even when she’s SINGLE. I believe he does it to try and mask his true feelings.. he’s using the ‘angry ex’ facade
thinking it won’t be obvious to Erin that deep down, his mind and heart is elsewhere.
It’s also clear because at the end in the car, look how he’s smirking and being with her when she asks about fixing his r/ship with Erin. Where’s the seriousness now, Manley?
Rant over guys, lol 🫣