English is not my first language so sorry for my grammar and such. So me and now my ex-bf, both in our 20s, have been together for 3 years.

We had an open phone policy so we knew each other’s passwords and such. The other day I happened to find out through his texts that he’s been lying to me about his whereabouts and secretly texting his ex-gf (which we already had an argument about before and he knew it is a big boundary for me).

For example she sent him a pic something along the lines of “love that you’re mine forever” which he reacted on with a heart emoji and the next day he started texting her about wanting to meet up. Go to the movies together and such.

To clear up the lying- he lied about being outside with his friends, but he was 1on1 with his girl friend. Which I don’t mind he hung out with her before too, but why lie about it?

Later he noticed i was upset, but I told him I didn’t wanna talk about it. He pressures me so I ended up telling him that I knew about the lying and texting. This is where it went downhill..

He started blankly defeating his actions, accusing me of snooping through his phone even tho we had open phone policy, telling me I’m pitiful and stuck in the past (when I attempted to explain how I felt by making an example of past thing that happened). In the end he told me that he was done and is going to enjoy his life full of money, gym, smoking w and b1tch3$.

In that moment I broke down crying really hard and all he did was tell me that he won’t hug me because I made him mad and upset.

Later I texted him to get some closure but he just insulted me and told me we’re done.

So AITAH for bringing it up and am I as childish as he tells me?