Michael Sam Reunites With Ex-Fiance ... But Something's Off

Can you really just be friends with an ex??

Michael Sam seems to be trying with his former fiance Vito Cammisano -- 'cause they just reunited for the first time since they broke things off back in June.

Sam and Vito hooked up to make a video for Vito's YouTube channel promoting Spirit Day -- where people are supposed to wear purple to take a stand against the bullying of LGBT youth.

First off, props to the guys for putting their issues aside for a good cause -- but check out the clip, you can tell things are still a little weird between the two ... as it would be with most exes after a breakup.