Obviously MC doesn't have the maturity to be in a relationship. She spent so much time asuming things that she is completely detached from reality to the point that she see herself as some kind of martir. She acts way beyond her insecurities.
Haruki is like a piƱata to these girls. The poor guy. I mean, he should find a better way to explain what exactly is going on with Hazuki, but even if he does, knowing the FL, she is going to start assuming things on her own every damn time, So why bother lol
Saying "I want to marry and have a family with you" is so unclear, that does not count as planing a life, my guy. Is she wants to use birth control that's her choice. If you really want to have children you need to sit and talk like adults without pressures. He is just trying to trap her. You just don't stop birth control over some shallow plans. I insist: "I want to marry and have a family with you" is not a proper discussion nor a reason to stop using birth control. Maybe he is a failed comic artist and is trying to live his dream through her.