Should I end my Haram relationship abruptly due to religious differences or should I wait for an appropriate time to do so after discussing it with my partner?
Haraam (unlawful) relationship must be ended immediately because it is Haraam. Whether there are religious differences or not, every Haraam is sinful act and must be stopped with out any delay. Discussing religious differences can be later but no way we can continue any Haraam relationship.
Wassalam.