World is crashing down

So it's been a week and i'm still blaming myself....There's got to be something wrong with me or something i'm doing wrong or not doing right.... Flat out it's got to be my fault :(.....My boyfriend and I are breaking up i'm not really sure why... h\He says we've changed I think we are both just going through a hard time and don't know how to cope together or alone. I just feel like my whole world is crashing down on me and there's nothing I can do.... I feel so helpless.... I no longer have that fight in me or the strength I once had....I feel like just rolling over and giving up....