Xen Memor. 4, 7, 1 πάντων μεν ων οίδα μάλιστα έμελεν αυτώ ειδέναι…that is to understand or to discover for himself, right?
It’s αὐτῷ, not ἑαυτῷ or αὑτῷ, in other words, not the reflexive. Secondly, it’s the dative with μέλω:
- 3 sg. is freq. used impers. with the object in gen., and pers. in dat., ᾧ μέλει μάχας to whom there is care for the battle, who careth for it, A.Ch.946 (lyr.), cf. Ag.974; ἐμοὶ δʼ ἔλασσον Ζηνὸς ἢ μηδὲν μέλει Id.Pr.938; θεοῖσιν εἰ δίκης μέλει S.Ph.1036; Ζηνὶ τῶν σῶν μέλει πόνων E.Heracl.717; πάνυ μοι τυγχάνει μεμεληκὸς τοῦ ᾄσματος Pl.Part.339b; also μέλει μοι περί τινος A.Ch.780, Ar.Lys.502, Pl.Alc.2.150d; μεμέληκέ μοι περὶ αὐτῶν Id.Cra.428b: less freq. with ὑπέρ, εἴπερ ὑπὲρ τοῦ κοινῇ βελτίστου δεῖ μέλειν ὑμῖν D.21.37.
Liddell, H. G., Scott, R., Jones, H. S., & McKenzie, R. (1996). A Greek-English lexicon (p. 1100). Oxford: Clarendon Press.