Lol. Here's what really happened between Rih & Nicki.
In 2012/2013, Rihanna & Meek used to hang out a lot. It wasn't confirmed that they were dating but they basically were.
A couple months later, in summer of 2014, Nicki had a lot of problems in her relationship with Safaree and she would go to Meek because they were good friends and she trusted him. Eventually, later that year, Nicki broke up with Safaree and started dating Meek.
This is why Rihanna unfollowed Nicki on Instagram in summer of 2014. Everyone thought she unfollowed Nicki because of the lap dance with Drake in the Anaconda video but it was actually because Nicki & Meek started dating and she was pissed.

You can find tons of articles online about Rihanna & Meek's under-the-radar fling.