My stepson is driving me crazy its making me resent my husband?

my stepson moved in with us in feb a month before he is 18 and he argues and fights with me all the time it seems like i am losing my husband because of are fighting but i cant take it he is literately driving me crazy my husband was on my side basically with him but lately its like he dont want to even help with him he works out of town alot so its me and his son i thought about leaving but i love him we have been married for 2 years and been together for 3 years i dont know what to do