What steps forward should I make with this situation?

I admit that what I did was wrong overall, but we both clearly need to work on this.

A few months into our relationship, my partner became emotionally distant and stopped being intimate without explanation.

I tried to address it by asking if something was wrong so I could understand, but he dismissed my concerns and avoided opening up.

Over time, I grew more worried and felt undesired, which triggered unresolved feelings from past relationships I didn't realize i had.

Eventually, out of desperation to understand what was going on, I glanced his recent messages with friends when it was left open. I wasn’t looking to invade his privacy—I wanted clues about what might be stressing him out so I could support him. I fully gave him that faith.

Instead, I found messages with a female friend that felt inappropriate for our monogamous relationship. For example, he called her "dear heart" over and over after she said it flustered her, that's more than close friends..

This deeply hurt me, but I also recognized that the dynamic might have been blurred by his past in polyamorous relationships. I even pointed that out to him

When I confronted him, I explained my emotions and my reasons for looking at his messages, that I wanted a small boundary with that kind of talk, and to communicate with me why he was different.

I gave him the benefit of the doubt and asked for better communication and boundaries moving forward, However, he focused on my invasion of privacy and it seemed he didn’t acknowledge my feelings or ideas.

He started holding this incident against me, saying he doesn’t trust me, became really secretive.

He also caims that he thought I was going to leave him when I stepped out for a breather to not overreact, and he says he was giving me a "second chance" when he told me that if I left, we were over.

How can I initiate a conversation to encourage better openness and mutual understanding so we can prevent miscommunications and build trust moving forward?

What steps forward should I make with this situation?
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