You see on Saturday night, he dumped his fiance Monyetta Shaw - who also happens to be his babys mother (2 kids). He tried to make himself sound all sensitive by saying "I will always love you . . but the whole thing was real TACKY to do in public.

A insider who is close friends of Monyetta told us, "She and NeYo were having issues, but nobody knew he was going to put her out there like that. It was very tacky . . . and very THIRSTY" Truth be told, Mo is a FRIEND TO THE SITE and a very dedicated MTOer - so we're MAD that fool did our girl like that.

Anyways, NeYo showed up to the BET Awards with his new girlfriend, some "singer" he signed