The Sun-Pluto type is so committed to anything that is genuinely cared about and will often show a deep affection for loved ones, and a powerfully protective nature, safeguarding and shielding those they treasure from any sign of danger, real or imagined. When the person is involved in a project/individual their penetrating and emotional nature means they can get attached and totally absorbed in a belief a person or an idea. A lust for something, and usually intense longing for some kind of fulfillment is present, and the Sun-Pluto individual has a piercing quality, one that reached straight into the heart and soul of the matter. It is rare for these people to make a neutral impression on others, and many of their personal relationships need to contain the big three - passion, intimacy and commitment.
If this seems 'unfair' it is only because you are ignorant of the chain of events, of previous actions or failures that have been amounting to a Critical Mass over some time. Sooner or later comes a time and a circumstance where there is no room for equivocation or compromise. It takes concentration of experience to force you to concentrate, and look more deeply into the root causes of things. Sun Square Pluto - Exposes the Individual to the Darker Aspects of Life
The square aspect develops and strengthens the personal will, because that is what is needed to meet its demands. Lack of skills or resources to meet any current crisis may be a cause for frustration or concern. The aspect implies the direct application of energies to accomplish immediate ends. The energies or types of actions symbolized by the planets involved will be applied forcefully. The square's mode of action is abrupt and creates discomfort, which is a spur to action, and also producing turning points in the life, with critical junctures. This aspect is one of obstruction, disruption, imbalance, frustration of desire (or self-realization through heroic struggle) and is the most dynamic of all aspects. It allows for the building of frameworks or structures on which the future will depend. By Wikipedia