I've always had an anxious / overthinking mind. Certain scenarios are always stuck in the back of my mind until I finally decide to do something about them then a new scenario just takes over and I'm stuck being anxious again for months / years. 

An example is one day I would suddenly feel bad about bullying this kid in the past then I would keep obsessing over that until one day I decided to apologize to him and his response was that he was fine and he didn't care about it. Then after some time, I will start to think that I have treated my ex girlfriend quite badly and start to obsess over that thought for a few months until I finally decide to message her and say "I'm sorry for treating you bad" in which she replies with " It's fine, no need to apologize". 

For the last few months I've been anxious about this other scenario. This is that one time my dad asked me to help him share a file and I saw an app with a big red heart on it. He has cheated on my mum in the past so seeing this just got me thinking if he is using a dating app? Afterwards I went to search up all the dating app images to see if that picture matched with any of them so I can be sure if he was using a dating app or not but was unable to find any matches. He hasn't shown any other signs of cheating and is always home etc. So I was just thinking if I am overthinking again. 

I feel like If i do confront this issue and ask him if he's using a dating app and "resolve" this issue, another scenario will just pop up and replace it and I'll be stressed over another thing and the cycle of never-ending anxiety will continue. There are more examples of these scenarios but I have just named 3 for this post. These scenarios always take me a long time like months to confront with the targeted person, because maybe the logical part of my brain is fighting with the anxious part of my brain and telling me that I'm just overthinking and nothing needs to be done, but in the end the anxious part always wins. 

I wish there was a way to target this core problem?

Any tips or comments would be helpful :)

Thank you so much.