There are several synonyms for the phrase "hadst to oneself." Some alternatives include "kept to oneself," "reserved for oneself," "held onto," "retained," "concealed from others," "restrained from sharing," and "maintained in privacy." These phrases all convey the idea of not sharing or revealing something with others. Whether it refers to a thought, possession, or emotion, the concept of having something to oneself implies a level of privacy and ownership. Using synonyms for "hadst to oneself" can help add variety to writing and make it more expressive and engaging.