Mixed feelings

Well I've been married for about 5 years I've been separated about a year now due to him mistreating me and my kids I recently decided to give him another chance but then someone else came intoy life and he treats me good we never had any type of action happen between us but yesterday he pun four that I'm going back in three weeks he aske me not o leave not yet he told my brothers wife that he would like to be with me but cause I'm was planing on going back I really don't knw what to do my heart is in peices cause I'm not all that sure that my husband changed I'm scared that I go back and he's worse and I'm scared if this other guy is the one for me idk I need help ladies please?