I just think MC isn't ready for a relationship. It's not that he doesn't trust in ML's love. It's MC nonexistent self-confidence/worth/love that makes him think he doesn't deserve ML. Inadvertently, leading to a self-fulfilling prophecy of ML finally leaving him.
Yes, yes, YES! It's pregnancy time baby! After so many tumbling and turmoil we finally get to see their hard-earned happiness.