Ladies, what would you do if your soon to be mother in law said this to you...?

[An Alternate Angel]

Recently my fiance's mother got into it with me because I told her I felt as if she was ignoring my feelings (my fiance has cheated on me and she is acting like he didnt do anything wrong) She ended up calling me a bad influnce, a concieted bitch who only thinks of herself, telling me I was stealing her 'life partner' and then telling me my fiance had to choose between her or me... my fiance and I ended up leaving... he was in tears... all was well in the end when he told her if that was the way it was going to be he was going to leave us both... she apologized and tried to make everything right by telling me she loved me and blah blah blah...

I don't know... I still feel uneasy about her... she called me a bad influnecne yet I got her son off drugs while she was giving him money to support the habit... I got him to stop drinking hardcore, cleaned up his act, got him a job and moved him out of her house... YET I'M A BAD HABIT!?

I don't know... how would you feel? and what would you say to her? How would you act around her? Because I dont know what to do.