Feeling kinda guilty!

So I work in a very low staffed place, everyone knows everything about everybody, a lot of women and a lot of drama. We had one guy start not too long ago and he's a complete douche, messing stuff up, talking about people, etc. He brags about being a "stay at home dad" while his fiance works (shes also 8 months pregnant). So he just started and I notice he's getting pretty close with another girl here...now I run a busy night with her and do like her, but we aren't "friends" and dont share personal info but shes starting to slip up that her and said douche are hanging out. Birdy around the workplace is saying they finally started sleeping together after work and he's planning on leaving his 8 month pregnant fiance for her. I keep hearing all of this and I'm like damn, that poor girl. Mind you he also has 3 other kids in different towns that he doesnt see. So here I am literally right now working with the girl and I investigated and found the guys fiance. I found a mutual friend and turns out there were cousins so I told her everything that I've been hearing at work. Being pregnant myself I would want somebody to do that same. I only feel guilty because the girl I'm currently working with is the one fucking him and we're cool, hate getting in other peoples business....the cousin swore to secrecy so I'll never be found out, but fuck that guy. Was I wrong?