Sure thing. Like most things about Magik, her relationship with Kitty is up to different interpretations. For example, when Kitty danced with Larry and Illyana was dismissive about it - was she jealous, or envious? Or was it just "she's my only friend, don't want some guy taking her away" platonic jealousy?
From writing perspective, Illyana is a character whose appeal is partly based on aura of mystery around her. Showing her in a relationship would force her to expose her inner self, which she in-character seems unwilling to do, and on meta level, writers are unwilling to do too. So keeping her single works on both levels.