They become thick as thieves and she really looks out for him but considering how in the small picture the eyes are yellow and not blue I am assuming they split at some point and she actually more officially becomes his guardian spirit but that last part is my assumption
Love the mc~ but I still really hope he will pick some/or all of these 1000 years old techniques and fuse them into one... not taking the 6 techniques Mengmeng was already quite out of character and logic from him... 😵😥