I think the ML has an aloof personality, but I also believe he hides or doesn't mention his pervious relationships because a situation may have happened where they also questioned if he truly liked them. But you can tell something has happened because he sometimes questions how he should have done this less or etc when with the MC. I think he's very much serious about our MC but he's also being cautious with him too. But this isn't really benefiting him because it leads to the MC misreading his caution as lack of interest for him and their relationship.
I think the ML has an aloof personality, but I also believe he hides or doesn't mention his pervious relationships because a situation may have happened where they also questioned if he truly liked them. But you can tell something has happened because he sometimes questions how he should have done this less or etc when with the MC. I think he's very much serious about our MC but he's also being cautious with him too. But this isn't really benefiting him because it leads to the MC misreading his caution as lack of interest for him and their relationship.