Wht do u do whn a best frend of urs leaks all ur secrets to ur brother n later apologizes so shud i forgiveher

thr was dis gurl hu i sed all my secrets v wer 3 best frenz. one is i know from my childhood she's my czn as well she never broke my trust,one day v did sumthing wrong not dat wrong but pple call it wrong n my brother asked this other best frend of mine she sed him all dat me n my czn was doin b'cos of her i lost my bestfrend n czn,so later she says she did'nt knew bout the consequences so shud i forgive her?i think she's lying.