Yes he does, as a matter of fact Kira and Lacus are one of the few solidly implied relationships in Gundam SEED as others (Athrun and practically every girl in Destiny) are left unresolved.
Yes she does love him, it was a slow but sweet relationship that started from when they first met and grew on from when she nursed him back to health. It is confirmed for the viewers when she gives...
Yes she loves him deeply, and Kira and Lacus proves to be one if not the most strongly implied relationship through the entire series, as there feelings are never doubted through actions nor words...