Why did she do this? I'll answer yours?

[MERIL]

What did your friend exactly check? relationship status?pics of them both together?again are you sure its the same guy? it could also be that they are just friends!!
And she actually came to see you...

if that guy is her boyfriend she must be playing with you and came to that restaurant to make you jealous and see your reaction and just wanting for attention from you....
find out properly who that guy was..
if its her boyfriend hell with her she's just a liar and was cheating on her boyfriend too...
if he's just a friend things will get back to normal between you both..
wishing you all the best!!
much love...
good luck!!!!