Is this lie worth calling it quits?

I've been with my partner for 7 years and we live together with our two kids (his and mine). When we started dating I quickly learned he has anxiety, depression and narcissistic tendencies. After many fights and almost breakups, he promised to start getting help and said he would go to therapy. This was HIS promise to me and not something I demanded but something I was happy about. This was 2 years ago and yesterday I learned he's been lying about going. He went to maybe 5 sessions and hasn't been back since. I think he sucks for lying about it but what is making me consider packing up and getting out is that over the last year, every single time we get into an argument he would throw in my face that he is trying to get better by going to therapy. He has even accused me on multiple occasions for not caring about the fact that he is going to therapy and has said "he is obviously the only one really trying"! It's one thing to lie but an entire other thing to use the lie to make me feel lesser then. I am livid and now can't help but wonder what other things has he lied about over 7 years. So, is it worth it or is this the last straw?

Is this lie worth calling it quits?
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