Hello people im Natasha, can anyone help me with a big problem i have about me and my partner!!?

Well i have new my boyfriend for like 10 years and before we got together we got on really well we always made each other laugh and loved to talk alot we was really close! we decided we liked each other alot more than friends an got into a relationship we have been together 6 months, but now we seem to argue alot an we never ever used to argue !! we dont really see each other that much no more do you think that could be the problem coz we did used to see each other everyday do u think coz we dont see each other thats why we argue ??