Floyd Mayweather says he broke off his engagement with Shantel Jackson because she got an ABORTION without his blessing ... this according to the boxer's social media pages. Floyd's Facebook page AND his Instagram account each displayed an image of what appears to be ultrasound results and analysis showing at least two fetuses.

The document was accompanied by a caption that read, "The real reason me and Shantel Christine Jackson @missjackson broke up was because she got a abortion, and I’m totally against killing babies. She killed our twin babies."

Floyd and Shantel split up last year ... after Floyd had given her a $10 million diamond engagement ring. Jackson recently told us she has moved on.

We've tried to reach out to Floyd's camp -- so far, no luck.

*This article provided to Doghouse Boxing from our friends at http://www.tmzsports.com/

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