Problem with multi-classing is that you dilute your abilities - Yes you would get access to Immunity to fear, diseases, better saves, lay on hands healing (way better with fey foundling feat added in), paladin spells, etc but there are issues with doing this... Your character would now be forced to abide by a code of conduct as a paladin- fail to to abide and you will lose access to the abilities you have diluted your character for...
Basically it is up to you whether you do this but you have to have some plan as to the character eventual goal..