I am seeing alot of a christian girl named Kim. We have been friends for about a year now and we really like each other. She tells me that she likes me and she and i seem to get along together well. But the problem is, i have an old friend, Josh, telling me that she is a skank and that she is using me and she's going to stab me in the back. He is her old boyfriend, and i don't really believe him at all, but there is a part of me that believes him. i don't know what to do. I have prayed to god about her and if she is the right one for me, and now im with her, but something wants to believe what people are telling me. I have told her about it and she says that its not true, but i still can't help partially believing what they say. What should i do? i really need some help.