Well, a source close to the (unofficial) couple told E! News that it's all because Rihanna's a commitment-phobe.
"Rihanna and Drake are hanging out a bit more lately. Rihanna loves Drake, but is still not ready to put a title on them," the source said.
"Drake would make her his girlfriend in a second if he could. It's more on Rihanna, though," they continued. "They both care about each other and are having a good time spending time with each other. Drake has expressed to Rihanna that he only wants to date her and only her, but she wants to take it day by day this time around."
The source finished up by adding, "Things are great though and their connection is really strong. Things are progressing nicely."
Looks like Rihanna just isn't into labels. Meanwhile, Drake, clearly smitten, is posting cute pictures of them on Instagram.
[Photo: Getty Images]