Funny how intense this discussion about Ian and Mina has become.
My two cents.
First, Pale Carnetion is a really interesting work about people with Daddy issues, Mina has them, Ian has them, Hana of course, even Veronica, Felicia and Rose has them.
Second Ian and Mina relationship, to me, is about this, for one Mina follow her dad philosofy, that giving is the most important thing, but with Ian she wanted to show that she isnt like her mother, that she could mantain a relationship no matter what, instead Ian wanted to have fun first, but Mina, who is really smart, see more in him than a horny wallet, and that bothers Ian a lot, because only Dr. Chuck and Mina were seeing him with expectation, not his mother even less his father, so Ian couldnt help himself but see how much Mina would permit before finally getting disappointed, perhaps he was testing if his own uncle would give up on him too some day...
Both have a toxic relationship and i love how TD show us that it isnt necesary to be an asshole to get into a Bad relationship.
Funny stuff, with everything Edwin have inside he is the healthiest person in the game.