In September 2025 I found out my partner kissed another girl the month prior. He didn’t tell me, although I later found out he was planning to but scared I’d leave the moment I found out.
I’m 27, he’s 28 and the other girl is 22. They worked together for 4 months until she left, and the incident happened on a work’s night out.
This is my first relationship and his third. We’d been together for 4 years by this point, and I was truly devastated. We still live together as I have no place to go. Seven months later, he’s very persistent with me and wants me, and he’s adamant it’ll never happen again because he knows the root cause. Given my naivety in relationships, I didn’t realise how much work has to go into keeping each other happy and supported.
For context… since the beginning, he’s supported me emotionally and financially and I’ve sat back with my feet up. I rarely matched his efforts. For a long while, he’d been feeling sad about the thought of me leaving him (he didn’t feel good enough for me, apparently). He also began having huge stresses at work and with his father due to his declining health. He told me that ultimately, he was too scared to ask for my help because I’d realise I “deserve better”. He thought he had to be the provider in every sense and even though I’ve always been sweet to him, he’s never felt supported by me like I have with him.
When the kiss happened, he told me it was because she was offering him comfort and in the moment he took it. He then met up with her two days later to apologise and tell her that what happened will never happen again, and they’ll never be together as that wasn’t the reason for their kiss.
Really don’t know what to do. My mum and close friend agree with my ex-partner, saying that it’s a chance for me to grow within the relationship and for him to grow as an individual. Any help to advice appreciated. I’ve give him the option to leave and be with her plenty of times, he genuinely doesn’t want to. I’m struggling to move past it. I feel so angry and bitter and I’m being nasty to him a lot cause of my resentment.