Trust issues in relationships. How should we trust? Totally, In percentages or we don't trust at all?

Having read a few books on relationships, partnership, love, courtship and marriage,  i found a common factor to them all. i realized how important trust and love is to any relationship.  speaking to people and relating with them on the issue, i also realized we all have different ideas on what trust is or should be.

A lady told me once, ''naturally when i meet a guy i do not expect him to trust me because i do not trust him either''. Then i wondered, how do you guys say you love each other? I have met with those who believe trust is the base on which a relationship grows and love is the nutrients that keeps it nourished, if  trust is lost, the relationship cant grow no matter how much love its got in it . something like,  there should be trust from the day you guys started dating so the love can grow. 

Certain categories of people also believes there cant be absolute trust, in fact, you give a particular percentage of trust so u are not disappointed . i find this quite interesting knowing you could actually push a scale on the level of trust you give in a relationship? wouldn't that be ''conditional love''? when you have certain things as yard stick before u give your love. or are we going to the point where it is possible to love without trust? and or relationship thrive on love only ?

What does trusting someone signify? what is the concept of unconditional love and trust ? knowing a love based on anything is conditional. e.g a love based on fear is conditional, love based on money is conditional, would a love based on trust too be conditional? would expectations and relationships mean same thing in relationship? 

These questions comes to mind and would need critical analysis. feel free to write your comments and opinions.