Boyfriend claimed son behind my back, thoughts?!

My boyfriend and I have been together for five years and have DEFINITELY had some serious downs together. I had a child prior to our relationship who is now 8 and we share a 2.5 year old son together.

Last year he received the pandemic unemployment but it wasn’t taxed so he was going to owe this year. I on the other hand did not. He knew I did not want him to claim our son and I told him I would help him pay back whatever he owed but I would get back more money and honestly last year was a terrible time, I took care of our kids while he was on some... other stuff ( getting mad going to motels, staying away, emotional abuse) etc etc but the point is I took care of our kids while he was definitely bullshitting. Well I tried to file my taxes the other day and it was rejected because a dependent had been claimed. He lied about it for the first thirty minutes then finally came clean about the whole thing. Says he was scared of owing the IRS, he IS getting a small credit back which he swears he will give me blahblah. But my thing is you lied, you did it AFTER the miscarriage I recently just had ( like we had deep talks and idk y’all just it was a tough time), you deleted all your emails to ensure I didn’t find out. This isn’t the first time he has lied, tried to hide things from me 😕 I know what everyone will say I just need to say it I guess. Has anyone ever been in a simplistic situation and been able to salvage your relationship?! He wasn’t like this before but ... idk who he is anymore and definitely can’t trust him. The thought of getting to know someone else feels so taboo or something.

I asked if anyone was able to salvage a relationship similar to this, not that I wanted to stay. Our kids absolutely adore him so yes if there’s ANYTHING that can happen to help him and make me feel differently I want to try that. Overall I feel very exhausted with our relationship. I wish I had more support with the moving process. Thank you to whom were kind.

When people are going through things it’s more beneficial to be kind rather than rude & snotty as if life couldn’t happen to you either. I don’t see the point in making someone feel even worse about themselves.