A friend's sister-in-law tried to make out with my boyfriend and he refused, but kept it from me for 4 months - I am right to feel betrayed?

Hellisia
My boyfriend S. and I have been together for 2.5 years. He went out of town 4 months ago to attend a friend's memorial. I didn't know the friend well, and he told me that he wanted to go without me. Recently, it came to light that at the memorial he and our friends were drinking and hanging out, and our friend's sister-in-law tried to make out with him. S. told her he is happy with me refused.

Later in the night the woman's husband (our friend's brother) and a second guy approached S. with the intention of kicking his ass for trying to mess around with the brother's wife. S. was able to diffuse the fight and set it straight that she had come on to him and that he refused her. He did not tell me anything about this happening for the next 4 months.

Recently, our friend that was related to this couple passed away, and the the couple came to our town for the memorial. I had no idea at this point about the woman trying to seduce S. I met her and gave her a hug at the memorial - S. saw this. 1 1/2 months went by, and a conflict came up between the brother and our friend group. We were all out at a bar talking about the conflict, and S. told me what had happened when he was out of town. I was shocked that he did not tell me about it. I felt betrayed and got upset with him. He told me that he is going through a lot and didn't know how to process it, and only told our friend related to the couple much later. He also said that he didn't want to tell me about it because it would upset me and that he didn't have the emotional energy to deal with that.

I am very glad that nothing happened between S. and this woman, and think he did the right thing in dealing with her. But I do feel like he broke trust with me by keeping it from me. I'm an adult and I don't like the idea that my partner thinks he needs to keep things from me, especially given that this person is not a complete stranger and that I did end up meeting her with no idea about her behavior.

What do you guys think?
A friend's sister-in-law tried to make out with my boyfriend and he refused, but kept it from me for 4 months - I am right to feel betrayed?
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