Biblical concept of marriage as it is remains beautiful and solid. I have never subscribed to the concept of looking out for myself within the confines of love/relationship/marriage. The moment such a thought keeps coming up ask yourself, "am I equally yoked here?" Reason is-

-that perfect love drives out fear and wanting to look out for yourself or putting in place contingency plans within your marriage goes on to breed fear and feeds into the very thing you think you're protecting yourself. What's crucial however is, apart from God, you won't know-

-what perfect love is. That love you can only give to your partner AFTER you let it flow within you from the source itself (God). Perfect love won't make sense according to standards of this world. The forgiveness, unconditional love, it will appear foolish, but it is the one.