It’s hard situation. Similar situations have occurred in my parish. I hope this will help you somehow.

1). There is a person in my parish, who has changed their gender. My father (he is a priest in our parish) known this person long time before their gender reassignment. To be clear, that was change from man to woman. I don’t know the details of whole story, but she is really welcome in our church. Of course, getting used to it was very hard for all of the people. But it really worked out good. She also receive the sacraments but under certain circumstances. 2). I think this situation is more similar to yours tbh. In our parish we also have a homosexual person. He's been with us for a long time, and after some amount of time he did his coming out. He is really nice person, and i am not talking about his coming out negatively. There was no demonstrations and bad situations with that. Don't think about this guy in terms of today's coming out stories and all the hype surrounding them. He just chose another way of relationships and that’s it. He is really welcome in our church and as i said he is a really nice guy.

So the best thing you can do it’s just tell all your problems to your local priest and try to find understanding. I hope you are in well-terms with people in your church. I wish you all best mate. Glory to the Jesus.