Bobbi Kristina Brown's boyfriend regrets not getting to her sooner to perform Cardiopulmonary resuscitation (CPR) on her.

Nick Gordon, 25, took to his Twitter account today (23.02.15) to share his guilt of not getting to the 21-year-old beauty fast enough on the day he found her unconscious in a bathtub at the home they share in Georgia on January 31, and wishes he could swap places with her as she currently fights for her life.

He tweeted: ''My only regret is not getting to @REALbkBrown faster to give CPR (SIC).''

He added: ''I love @REALbkBrown we both share the same fate. You're going to wake up but I need it to be undalay. I don't care as long as Krissi is ok. I wish I could trade places. (sic).''

Nick also took a swipe at Bobbi's father Bobby Brown for allegedly banning him from visiting the aspiring actress at Emory University Hospital in Atlanta, where she's been for the past three weeks in a medically induced coma.

He wrote: ''Crazy how all the Browns came to the hospital when this went down. I've been with her 24/7 watching over her and mom. Bobby left when it got heavy.''

He added: ''I have to remain strong for me and @REALbkBrown

''Bobby seen his daughter 4 time in the last 5 yrs

''Now him and his family want Whitney's $$$ which belongs to Krissi or Cissy (sic).''

Nick was unofficially adopted by Bobbi's mother, late Whitney Houston, when he was 12 years old.

He and the young starlet claimed last year that they had married, but Bobbi's father's lawyer recently revealed they never actually legally tied the knot.

Meanwhile, police have launched a criminal investigation to find out what happened to Bobbi - who is now believed to be showing signs of improvement - in the lead up to the incident.