Co-parenting? Yes.
Co-dining na parang mag-jowa ulit? Big NO.
At ang “nagutom ako” hindi reason para i-sideline ka. She could’ve messaged you, and ordered food.
Pwede naman maging civil sa ex nang hindi nilalagay sa alanganin yung current relationship. Kahit tatay pa yan ng anak niya, kung committed na siya sayo, dapat may clear line between parenting and flirting with the past. "Tatay ng mga anak niya” is not a free pass to disrespect you.