Relationship advice

About three months ago, my partner met someone new and got very close to them. At first, I trusted them completely. Later, they admitted their conversations had turned into flirting, and they said they would set boundaries because they love me. I was upset but appreciated their honesty.

After a while, they wanted that person back in their life as a friend, and I agreed. But for two months, I felt uncomfortable. It was obvious to me that this person had romantic feelings for my partner, and I said that many times, but nothing changed.

Eventually, I found out they had actually been in a full situationship with that person. I forgave them, but I still don’t know how to move on or what to do.

Recently, they’ve also become very sensitive to jokes. They get upset easily and are now giving me the silent treatment, saying I’ve been bothering them too much, even though I see it as harmless joking.