In Jainism, all experiences and events in life—including significant ones like marriage—are fundamentally explained through the doctrine of karma. Karma, in Jain philosophy, refers to subtle particles that bind to the soul due to one's actions, intentions, and passions (kashayas). The fruits of these karmas manifest as various life circumstances, including relationships, health, wealth, and even the nature of one's death.

Pre-Disposition and Karma:

• What seems "pre-disposed" in Jainism is actually the result of karmas accumulated in the past (either in this life or previous lives). These karmas mature (ripen) at certain times, resulting in specific experiences or situations.
• The specific circumstances, such as whom you marry, the family you are born into, or the major events of your life, are considered the result of your past karmas coming to fruition (Niyati or destiny as per Jainism is just the karma's fruition).

Free Will and Present Karma:

• While some outcomes in your life are due to the ripening of past karmas (nisargaja karma), Jainism also emphasizes that you have free will in how you respond to situations. Your intentions, reactions, and decisions in the present moment generate new karmic consequences.
• In the context of marriage, the meeting with a specific person and the circumstances leading to marriage are the result of past karmas. However, your conduct, attitude, and choices in that relationship generate new karmas.

Summary:

• Actual karma refers to both: the karmas you have accumulated through past actions (which predispose certain events), and the karmas you are creating now through your current intentions and actions.
• Pre-disposition in Jainism is another way of describing the fruition of past karmas.
• Marrying a specific person is due to the fruition of past karmas. How you behave in the marriage and what intentions you harbor will create new karmas.

References:

• "Tattvartha Sutra" by Acharya Umasvati (5.1–5.20 on the nature and fruition of karma)
• "Jainism: The World of Conquerors" by Natubhai Shah

In summary, in Jainism, major life events like marriage are not random or merely pre-disposed; they are the result of your own past karmas coming to fruition. Your actions and intentions today will determine your future karmic experiences.