1: because Adrien pays barely any attention to Mari
2: you know what most people make MariChat books saying Chat has given up on LadyBug BUT LET MY TELL YA SOMETHING CHILDREN HE WOULD NEVER DO THAT BECAUSE HER TRULY LOVES HER AND HE WILL NEVER STOP TRYING SO BE LIKE CHAT AND ALWAYS KEEP TRYING
4: it's a wonderful ship and i need it to happen or I'll explode or I'll make a portal to them and tell Adrien to tell Everyone that's he's dating someone (ANYONE WHOS NOT CHLOE) and pretend to date them till Poor Mari gets upset and becomes ladybug and goes to the Eiffel Tower and chat will show up and help her and they will be a couple then Adrien will stop fake dating whoever and be super happy!!! But Alya will still think that Mari likes Adrien and she'll try to get them Together but then Mari be like "Alya honey I got a boyfriend" and then she'll realize her mistake and freak out and alya will be like my best friend has betrayed me... anyways I'll probably make that a book sometime in the future but in the end everything will work out fine :3