Between Xavier and Raven, a misunderstanding is keeping them apart. An invisible wall is preventing them to see what's in their mind. And maybe because of what they have been through, both of them closed the part of their brains to understand what's actually their actions meant.
Xavier hates Omega. Raven hates Alpha. With that facts, Raven don't need to think. There's no chance for them to get closer to each other. Especially that Xavier finally found out that he was being played by another Omega he trusted for 4 years.