The happiest day of his life and biggest of his career and she wasn't even happy for him. She broke up with him a couple of hours after getting the news, completely thinking about herself first. How is that any better? The only deliberation she gave was on the balloon, and they point that out her being self-centered in every episode. It's not bad, it's just not great for them.
Tariq's serious about his craft and career, an honest man, caring, and they showed he's not a dummy, and devoted to her. He let's her take care of him because he's broke. He jumped on the opportunity to excell once it was presented to him. He was already planning how they were gonna make it work, knowing she'd be moving with no job and he'd be taking care of everything. Like I said, he's a good dude.
They were obviously in different places in their lives, and they're still young. She was trying to plant her feet and build her foundation there, and he was trying to build his career...that was unpredictable, and not as fruitful at that time. He still felt like he had something there to pursue. It was him being with her, that led to him being able to find his niche to potentially drive his success as a rapper. They served their purpose in each other's lives at that point, and life was just taking them in different directions.