Love unguardedly...or wholeheartedly?

when loving...or falling in love...or being in a rship...

should 1 allow oneself to completely open up, unlock all emotional barriers, bare one's heart, and allow oneself to
love unreservedly, unguardedly? hence increasing the risks and consequences of being hurt? but also increasing the
odds that it would work out?

or would it be more prudent to tread very very cautiously, lest one opens up oneself and  thus increases ones vulnerability and potential to be hurt? and thus risk the other party also doing likewise since they see that u are 
not committing..and thus dooming what could work.

some say the latter, as u never really know or understand people, and people change. if u loved wholeheartedly,
when a change of heart occurs...you are left high n dry.

but if we do thus, would it not doom the rship? if both parties were afraid of emotionally investing and committing, then would it not severely dampen the rship's chances of succeeding?

all successful rships involve at least 1 party making that jump, that courageous and laudable leap of faith.

if we held back, we mights well not go into it, coz eventually, it aint gonna work out either.

i reckon we shud think v v v carefully BEFORE going into a rship. but once ur in, ur in. don't hesitate. don't shuffle
ur feet. dont wiffle waffle. dont stick one foot out the door ready to bolt at the first signs of trouble. think
carefully b4 u jump. but once u jump, JUMP. dont hop.

jury's still out on that one though.