Sometimes only cheating or other pieces of stuff are not the primary reason for a breakup; there are lots more than that. Especially women who don't realise how badly they are trashing their relationship with these annoying habits.
Let's see what are they down here.
..She'll just have a bite of yours...or several
..She's got to change her outfit.
.., you'll always be second to her phone.
..that you think is actually 'fine'
.. Whatever be your answer, nothing will satisfy her.