Let's say a person were to seek for, and enter a monogamous heterosexual relationship and eventually marriage, but actually he or she is either homosexual or bisexual (but more inclined to homosexuality).
This person may genuinely believe that he or she can live the heterosexual lifestyle and marriage, and persevere in making it successful, without infidelity, despite not being intrinsically or naturally heterosexual. This may be due to conforming to social norms, local laws (where same-sex marriages and homosexuality may be illegal) and parental expectations, plus the desire to have one's own biological children, the normal way.
This person may also avoid openly telling this to their prospective partner, otherwise they may lose their chance at being accepted.
Would this be violating the fourth precept of not telling lies (and not being dishonest)?
How should this person approach this situation instead?