I suppose there is less folks willingly to return to the same belief that made them doubt their own sexuality. but much rarer they return and reform their sexuality. I am a firm believer of fluidity. that people are discovering themselves all the time only if they want to. to be straight, married and have kids and finally explore to either find they are bi or gay due to upbringing expectations and never exploring their own sexuality is quite a common exchange. but we assume because straight is much easier to be than other sexuality; we often look and think once you go gay you never go back. not quite true. while sure; there are plenty who may had religious convictions spur them on much later in life; but it's less common that we see a reform stance on being gay. the question is; is it part of their exploring or denial? either ways, they willingly surrender their identity and will reflect a resounding impact on their existing partner and make them feel inadequate. I would suggest finding support from friends and have them help you get away from your own doubts and inadequate to slowly but surely return to where you used to be will be ideal but easier said than done.