Feeling lost 😞

Okay so me and my boyfriend have been together 5 years and now we are 5 months pregnant with our first kid . I have 4 of my own from my marriage . And let me tell u it's been a battle in it self . My two oldest don't like my bf and do things to make him mad and he takes it so personal and we get in disagreements about it all the time . Okay he has told me that we are just temporary , that I planned on getting pregnant that maybe he should get a dna test to make sure it's his 😢 . Anyway this morning I am lost my 12 year old decided to I guess runaway from home and I was up all night looking for him called the cops and had to file a runaway report . And my bf just went to bed . This morning he was mad at me telling me I was an ass to him and he was stressed . Oh then he told me its my fault my son ran away and I don't disapline him. I told him I think we should break up . And he had no response .. And I hate to say but this whole pregnancy has been sad and not exciting at all because of him. I know I can do it on my own I mean I've done it by myself with 4 it's just maybe I hoped things would be different I just feel like he is constantly making things about him and putting me down sorry guys I just needed to vent cause I really can't tell my family cause they think he is this great guy