First at all, always telling the truth with your friends is the most important since being friends started with being able to trust each others. If you can not be trusted, it is so hard to start making friends and even continue your relationship with your friends. In the opposite side, if your friends trust you because of you always tell them the truth, they will always have your back. Therefore, you know you are safe with your friends and your relationship will last longer than relationship without trusting.