CavallariCutlerFAcebook460.jpgChicago Bears quarterback Jay Cutler and reality starlet Kristin Cavallari suddenly called off their engagement Sunday, and now Cutler is coming out on defense for his former fiancee.

According to The Chicago Tribune, Cutler confirming the split via his Facebook page on Monday, writing:

    "Thank you all for the support, but if you talk bad about Kristin I will delete and block you. It's unnecessary and heartless."

He also changed his relationship status to "Single."

Cutler continued:

    "Also, don't say now I can play football, I could play football when I had her compared to when I don't. Football is the least of my worries, so have some respect."

Cutler, 28, and Cavallari, 24, had been engaged for four months and together for about 10 months. They were planning a spring wedding, and Cavallari intended to move to Chicago for the upcoming NFL season.

Rumor has it that Cutler was too possessive of Cavallari. A source close to the couple told X17online exclusively: "Jay and his family were making fun of Kristin's dad's height a lot, and she got sick of it. That combined with a few other compatibility issues, lead them to break off the engagement."

Cavallari Tweeted on Sunday night to her fans: "Thanks for the support. Love u guys."