Search Results: stay up and chat with a girl

Yesterday, my boyfriend's best friend (let's call him Nugget), a girl that I didn't know, and I went to help a common friend of us move her stuff to a different house. I had only met Nugget once before, very shortly.
But we had a lot of fun together and went for drinks afterwards. We were talking about 8 ball pool, and Nugget mentions that he is in a chat group with some people, that is used to ask 'who wants to go play pool Wednesday at 10?' or something, and then everyone available joins.
That night I was staying with my boyfriend, and I got an invitation to join this chat group. I joined, and told said something like 'Nugget added me to the pool group' to my boyfriend. He was immediately alert and told me that he thinks his ex (who I've never met, but who apparently absolutely doesn't like me) is still in that group. We checked, and she was indeed. I left the group, but now I'm concerned about Nugget adding me in the first place. Is he trying to start a problem between me and the ex and thereby breaking us up? I didn't get the impression that he hated me, but I'm not very good at reading people.

I met him 2 years ago. I was 21. He was 31. At first we were just chatting and talking on the phone. He was funny, cute, and charming. He was asking me out for like 2 months until finally I said yes. We went to many cute dates, he was taking me on his business trips and buying me romantic gifts.
One night we ended up kissing and having sex at my place. It was so good. After that we went to dinner and I said "You are an amazing guy, I'm surprised you're not married by now" and he went silent for a moment and then said "Actually, I am married". I couldn't believe it. But I stayed calm. I just asked him why didn't you tell me before, why do you ask others out? And he told me it was a mistake he married her. She doesn't love him. She is very much involved in her business which is in another country. So they don't spend much time together. They've been married for 3 years but they don't have kids. They hardly ever have sex because she doesn't want to. I felt a kind of sorry for him and I was thinking he deserved better. But let's face the truth: HE WAS A LIAR AND HE WAS DATING ME FOR MONTHS AND HAD SEX WITH ME BEFORE HE TOLD ME HE WAS MARRIED AND HE PROBABLY WOULD HAVE NEVER TOLD ME HADN'T I ASKED HIM! And he was cheating on his wife!

I was still chatting to him sometimes but I decided it's better not to see him, but after some time we met again. I tried to date others but I was in love with him. Until finally 1 year ago I met a guy who kicked him out of my mind and heart - my current boyfriend.

And my ex's wife found my shampoo at their apartment. He texted me telling me I was a bitch for leaving it there but the truth is he kicked my stuff out after a fight and didn't realize it was not hers. He is still texting me every few days even though it's been more than a year asking me to meet and saying I am the best girl and he misses me. Should I tell his wife?