After the fact, I don't think love can be something that can be rationalized. Trust is rational. You have some evidence, whether emotional or situational, that you base your decision on. More often than not, it's a conscious decision. Love, on the other hand, is much more complex than that, and wholly irrational.
Now, love can always be tempered by reason; intellectually, you might know that this person is no good for you, and intellectually, you know how you must adjust your behaviour and how you should react to the situation. The challenge is always trying to get your actions and thoughts to transcend those feelings. And those feelings, if its real love, is are difficult to throw away. Even if something as colossal as TRUST is broken.