Annoyed

Just had an argurment 2 hours because I told my boyfriend of 2 years I didn’t like his kids cursing. Maybe it wasn’t my place , but they are little all under 10 years old and can’t do anything for themselves and was cursing for an hour straight “ fuck you bitch “ kiss my ass & etc. I told him I was tired of hearing the cursing. He made it about himself , saying “ I’m a cheater , gonna give my pussy up “ & etc. I told him he can leave and take his kids, they left and I left and eventually texted and said they were hot in the car and I gave him the key. I felt bad , and when we talked again he still didn’t understand where I was coming from. Saying he allows the cursing and is okay with it. He said I curse so they can , I’m like “ what” I’m GROWN & pay bills