What happened and how did you rebuild afterwards?

Hello all, im a bit curious on something. I know every relationship is going to have its ups and downs. Eventually you are going to hurt each other in some way, that’s the cost of full trust. My relationship had a little bit of a trust rupture. An ex situationship that ended with no closure or contact before we met sent a text to my partner acknowledging she’s in a new relationship. He wished her good luck on her endeavors and she responded with frustration saying for a while she wished it was him but she couldn’t keep waiting around on him (he ghosted her all the time and she realized it wasn’t good for her.) He replied saying he understands and that was that. I seen the texts and asked her about it, she said she was annoyed at him. Given my history of being cheated on and lied to constantly, i told her that i would prefer if she let me know when someone like this reaches out just for my own comfort of knowing nothing shady is going on. I admit i did react at first as if she had betrayed me because i didn’t think clearly about the situation and what was said.

A couple weeks later he texted her again drunk apologizing for how he treated her and how she didn’t deserve that. She replied saying she had loved him so much that it hurt her when he disappeared, she said she probably would have married him if he had stuck around. He replied and said yeah I just wanted to apologize. That was the end of that conversation. She didn’t let me know about it this time but i found out a different way. I was highly upset that it felt as if she was hiding it from me, but her explanation was that she was going to tell me but timing wasn’t right and she was nervous about what my reaction would be. She does have a history of physical abuse from an ex who she really couldn’t say anything to without getting hurt so i get it. But the trust felt ruptured by this, call me insecure but im not a fan of contact with exes or people like that it’s never went well for me previously. Im currently in therapy for anxiety and taking care of the problems within myself stemming from past infidelity. It did drive me into being insecure and sometimes controlling as a sense of protection.

Has anyone else worked through a situation like this? If not, what kinds of problems have you had revolving trust or things like that and have been able to rebuild within the relationship? This post isn’t necessarily specific to my situation but more so seeing what others have gone through and made it out of positively.

TL:DR; I had a slight breach of trust within my relationship and am curious if others have been through similar and rebuilt through it. Also any other stories of problems that have occurred and how you made it through together.