Is my mom making the wrong decision?

im 19 years old, my mom is 38 years old, & my brother is 8 years old. we are very and i mean very close to one another, i love my mom & brother and couldn't live without them & vice versa. i used to live with them until the age of 18, at 18 i moved in with my boyfriend, so its my mom & brother just living together & i live with my boyfriend. but i come every weekend and even weekdays to visit my mom & brother. well the thing is that im really hurt about is that well my mom recently has a boyfriend and things between them are going really good im really happy for her and im happy that she is happy i have no problem with her new boyfriend but she says soon maybe after 1 year of dating or something like that you never know they might mary each other well my mom said if that happens and when that happens she wants to move in his house with him the problem is he lives in georgia and my mom brother & i live in washington, he is only here for 1 year because he workes in the military but ofcourse wen he's contract is over here he'll still keep seeing my mom & stuff but the point is im so hurt she wants to move in with him to Georgia because he has a house there and everything and my mom & brother lives in an apartment and stuff but i dont want them to move there i cant imagine my life without the 2 of them how am i suppose to see my brother we are so close and he is only 8 and my mom i need them both & the reason why i cant move there is because i love my boyfriend we've been together for 3 years and its his and mine first relationship and its the best relationship i could ever ask so i dont want to move and leave my boyfriend he is my life but i want my my mom to be happy is she making the right decision by wanting to move to georgia if they get married later on in the future? because im soo hurt by this and i dont even know if they r going to get married or not but if they do cant her boyfriend just buy a house here and move here why does my mom & my brother have to move there? plus her boyfriend has family and a son down in georgia, so he still gets to be with his family and son because he's living there but i dont get to be with my family? thats not fair plz help me is my mom making the right decision? and am i thinking right?