Karrueche Tran has branded Chris Brown ''weak'' for trying to ''force himself'' into her car.

The 27-year-old model has lashed out at the 'Loyal' singer - who she split from after learning he had fathered a child, Royalty, now 12 months, with friend Nia Guzman-Amey - for bombarding her with unwanted attention and not ''manning up'' and making changes to his life.

In response to Chris blasting her on Instagram for speaking out about their relationship in a recent interview, she replied: ''They asked a question and as a mature adult I answered. I'm not gonna shy away from something that I lived through.

''I'm not speaking on you or bashing you (like I easily could). Don't be mad at me because our relationship is over due to your lack of loyalty.

''''You know what's weak?? You forcing yourself into my car..my broken window..blowing up my phone..trying to shower me w/ gifts

''Man the f**k up and change the bs in your life like I've told you several times. (sic)''

Despite her harsh comments, the 26-year-old singer responded by thanking Karrueche for being ''part of his life'' and said he had learned a lot from her.

Posting a picture of himself and the model in happier times, he replied: ''I'm eternally thankful for you being in a part of my life. I've learned so much from you/

''I wish u nothing but happiness and the best. @karrueche all I was doing was trying to fight for the woman I love. Thanx I learned a lot.(sic)''

The 'Run It' hitmaker had earlier slammed Karrueche for her ''pointless'' remarks about him, insisting she should no longer discuss their relationship.

He posted: ''Honestly, it's so f***ing pointless to keep doing interviews about me. Talk about your career.

''If there is no more relationship then u shouldn't be doing f***ing interviews with people I won't let get the pleasure of prying into my personal life. S**t starting to get real weak now.''

Karrueche's remarks came just over a week after police were called when Chris followed her home after they were both at Club PlayHouse, despite appearing to be dissuaded to by friends.

Later that evening, the cops were said to have been called after Chris was heard ''banging and yelling'' on Karrueche's door early in the morning.