Of course, women's loyalty and true friendship exists, but, unfortunately, it can not always pass the test of the rivalry, characteristic of women. Men, of course, also compete with each other, but at the same time act more openly and directly. Women often show affection than actually experiencing it.
This is not to blame her best friend in a cunning, you just have to take this into account and reflect in their actions. Too great a temptation for a woman - to win over the guy who immediately became an overnight close enough for her.
When you introduce your favorite best friend, they thus also become friends. They both are the people that you trust. He also immediately feels for her confidence and interest as a person who knows you is greater than he who is familiar with your secrets with your past life. Initially, this interest can be effectively connected with your personality, but this might be a temptation for a friend. Using your favorite interest, it can gradually focus their efforts on what to turn it on you.
And then much effort would be required if a guy is too trusting and not very self-sufficient - a few hints, innuendo, significant silence - and he may begin to doubt. This may coincide with your quarrel or simply tensions. Rare girlfriend refuses to comfort an upset friend.
Try to avoid this situation and do not tempt any favorite or best friend. Just, just in case, do not leave them alone with each other and limit joint communication, at least for the first time, as long as your love will not be enough verified. These measures will help you keep your friendship.