I realize I'm a bit late to offer advice, but noticed there weren't a lot of voices offering how to work toward staying together. It seems that the OP wants to do that, based on their posts.
I learned through trial and error applying conflict resolution methods and conflict avoidance techniques in my own relationship. Thankfully, I'm not with her anymore, because of how abusive she was. But I managed to make it last for four less than ideal years, due to sheer determination, and maybe love as well. I don't want you to infer that I'm implying that your relationship is the same, if it were, my only advice would be; run far, and run fast. Look up malignant narcissists, and if he matches, leave and don't look back. One doesn't have to have high self esteem to be self absorbed and lack empathy.
After I was cheated on, I noticed a counterintuitive trust imbalance. She expected repercussions. I just loved her and slowly got over it, and I think that bothered her more than me just breaking up with her or cheating in response. It's entirely possible that your S/O is similarly expecting the worst from you because he's still waiting for the other shoe to drop.
My favorite less than helpful ear-worm, "A cheetah's gonna cheat." The 'Why?' tends to be a bit more arcane than "Because it's who they are." But I still like the saying. And to this day, I haven't stayed with another person who cheats on me or is abusive. But I am single...[emoji19]
In order to manage someone who gaslights, you may have to become comfortable with manipulation. I liken it to preemptive firefighting. Discuss problems in public, loudly if you have to. Being "that couple" is uncomfortable, but prevents the S/O from acting out. When you are alone, find ways to sidetrack or distract him before and when he becomes manic. As he will likely be more amicable in public than privately, to save face. Find help with his family, they can be remarkable at intervening and correcting erratic behavior.
When you try to discuss a tender subject, it's best to use active tenses and action words (especially with men). By saying "I can try," you are giving room for interpretation as to why you may fail. Instead you could say, "I want to be with you. This situation was unexpected and is trying, and I will do what's necessary to understand. I never imagined being in a heterosexual relationship at this point in my life, but I love and accept you no matter how you label yourself." It isn't bad to bring up your emotions, but making yourself clear when you have conflicting emotional responses is difficult and tedious and may require a captive and cooperative audience.
But by sticking to the realm of what you want and how you feel, it gives the other person less room to misinterpret your words and meanings. Nevertheless, body language and tone make up around 70% of what people hear. Make sure you have as much eye contact as possible, an open posture, and a calm soothing tone helps a lot as well. Touch, i.e. holding their hand shoulder or knee can convey very intimately your acceptance of the other person. Think of it as a confident portrayal of your intentions. After they know and feel your acceptance, then you can elucidate your misgivings.
Remember that you are not alone, and that your family, friends and in-laws can help. Whether they are serving as arbiters during spousal debate, to just taking your mind off your problems for a bit, they are an invaluable and often overlooked resource. Don't be afraid to ask for help or advice, if not simply a sympathetic ear.
Lastly, a lot of what I went over is worst case scenario advice. I hope and want to reiterate that I'm probably reading too much into things and applying my jaded views. I have gone over this post a couple times to soften it, but don't know how to make the harshness more palatable.
I hope internalized transphobia is the reason for his being so erratic, and that there aren't other reasons or substances responsible. I hope that you can regain stable and loving communication with him. And finally I hope that you retain hope in the relationship's success.
If you ever feel exasperated, give him space and do something fun or productive to take your mind off of it. Try not to rely on him, and maybe by letting him find himself first, you will be able to meet the more authentic version of him that you fell for originally. Don't be hard on yourself, it's a difficult situation and there is no perfect response to the text: "BTW I'm transgender j/k, no really I am... [emoji22]". He's going to need to figure his stuff out just as much, as there's no perfect way to be trans or disclose.
Forgive yourself for not being perfect. If he doesn't forgive you, F him.
Hope this helps,
Hugs,
- Katie
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