What to do????

I.just recently found out I'm.pregnant with my SO now everything was going good until about 2 weeks.ago we started arguing a lot and to top it off today is my oldest daughter birthday We took her out to.celebrate and her father came to pick her up with his girlfriend and my SO just started arguing again because he claims I just wanted to see my kids father!!!

Sooo annoying ,I'm seriously rethinking about this relationship I think it's time to.let it go !!! My feelings are really hurt ,he`s only thinking about himself but my daughters well being is my first priority!!!

IN NEED OF SOME SERIOUS.ADVICE