Kria broke up with him - WRONG!
Because of REY , Kria can't dance anymore! Nobody can deny it , the accident happened because of REY. So... He comes back with a broken heart leaving her alone when he put her into that situation , then sleeping around with a girl (not wrong cause he is single) and then goes back to his HOW COULD I DO THIS TO Kria jaap - WRONG!
Kria ignoring him - WRONG
But honestly , if anybody was there instead of Kria , they would have a different reason to ignore him , who would like to even see the face of a person who is a major reason for your dream being shattered into pieces?
Rey forgets Kria , and remember after commiting a "mistake" (It's like , a kid remembering god before his results or after his results) - WRONG!
Both are wrong , if Kria's reason had been different it would have been a bit understandable , the "true sacrificing" reason is simply shit! If Rey removes Kria completely from his thoughts and then "hangs out" with Sara it would be more understandable but this remembering Kria and blaming himself after getting close to Sara is again SHIT!