Should I end things wih my boyfriend?

'm trying to figure out what to do I'm 23 no kids never married and my boyfriend is 30 with two kids and divorced.Lately I've been getting more and more angry with him cause issues keep coming up and I don't know how to deal with them I'm at the point of just ending it.First problem started after I moved in with him his kids mom who was so evil to him became overly nice when I moved in and started calling him for other reasons than the kids and they became like best friends he even started picking up her brother's kids from school and still does.The next issue came with his female friend calling him at 11 at night and him answering it and comforting her while she goes on about her man problems.The last thing was today 11 tonight his play sister sent a suggestive picture text to his phone with two people you know then she called him.I got upset cause of the time and he disregarded my feelings saying she's his sister what should I do?