Instagram / @matt_hardeman @makensyjomanbeck

Makensy Manbeck & Matt Hardeman are through ... with the two announcing their split less than 24 hours after we noticed they unfollowed each other.

The two "Big Brother" stars shared their own posts to Instagram Saturday morning ... and, both Manbeck and Hardeman wanted to make one thing perfectly clear -- no one cheated in this relationship. Instagram / @makensyjomanbeck

It's actually one of the first things Manbeck wrote in her text posted she shared to her Instagram story ... adding Matt is still in her life, and she loves him a lot -- and, though she's embarking on a long road of healing, it isn't because he stepped out on her.

Manbeck adds she's grateful God put them in each other's paths ... even if they weren't meant to stay tog

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