My Relationship

So me an my s/o been together almost 7 years and his mom live with us and he have not worked for about 7 months and last night when I got home he told me that he was going to move in with his sister to take her daughter back and forward to school mind you she live two an a half hours away so he tells me that he's going to stay out there during the week an come home on the weekend so for 9 months I will only see him on weekends this pissed me off so I'm like fuck how I feel you going to just leave and how dare she ask him to do that knowing he have a girlfriend that he live with what should I do just break things off or stay in mad ass hell at his sister and mom I feel that they really don't like me anyway and he put them first at all times is really saying fuck me like I think I need some insight on this please help with suggestions