AIO - I need clarity. Mental health?

I am not sure how it happened. Last night I was on a few subreddits and I was getting messages and comments from random people. I came across multiple accounts that had photos and video of my ex. They were altered to conceal tattoos and facial features. I didn't believe it was my ex at first but I noticed there was evident photoshpping done in the places she has identifying marks such as scars, freckles, clothing, various items that she owns. I also noticed that some photos had added things like bellybutton rings and obvious digitally added tattoos, but different than the ones she has. It was clear that it was her and her identity was being concealed. But I'm just not sure if it was her or someone else posting the photos/videos. This has been going on for about 5 years according to the upload dates confirmed by auto-mods and comments. So, last night some people were messaging me with throwaway accts and some of the things they were telling me were not a coincidence or trolling. They had some information that was impossible for anyone to know without being in contact with her or it may just be her in concert with other redditors. It has gotten to the point that i can't tell if there are people on here that know me/her and want to throw me off or if she is doing something nefarious. It is making me question my own sanity at this point. I would love to say it is just trolls who have nothing to do with me or her but there was someone else who was being strung along this same way and it happened to be her other ex! At this point I am certain she is involved. And this might be some way to give me doubts as to what's going on with the photos and videos being uploaded daily. I've contacted her and she denies all of it. Calls me crazy and to seek help. It is really getting to me because now there are dozens of accounts that have been contacting me and disappearing. I don't know if it's just people messing with me or if she is trying to break me down mentally. Should I let it all go and delete this app? Should I seek the truth with the possibility of never getting it? This is not a joke and we have a child together. I don't wish to use anything against her or to expose any of her questionable activities but i would like to understand why she would do this and act like I'm mentally unstable.

Please do not comment on this post if you do not intend to help.