Why one lady can not bear the other lady?

simply because your partner should be loyal to you and have no other lady in his life... it's called fidelity.... there are certain levels on which you can consider other people in your partners life which are...FRIENDS- people who you and your partner know and regard as friends only without any emotional attachments and are not a threat to your relationship...then you have FAMILY- of course you know who are place in these category right???.... then there are the THREATS- usually the ex girlfriend or ex wife, colleagues which you undoubtedly know to have any special feelings for your partners. so there you are ladies can bear and be tolerable to different people in their partners life as long as their not considered threats to the relationship and to their self esteem.