Ok so my friend katie have this new guy she's been dating ,i feel like there could possibly ?

be a strong connection between them however i run to his ex girlfriend and somehow she started talking to me about him.base on what she say he's a real lier i try not to beleive what she says because i tought she just wanted to play you know the gamees that ex'es do but i just found that he is a star help please my friend is a strong devoted christian what should i do i know i should tell her the truth but it will break her