Billy Bob Thornton Why I Didn't Send Angelina a Wedding Gift

9/6/2014 12:10 AM PDT

Billy Bob Thornton is still on good terms with his ex-wife Angelina Jolie ... but that doesn't mean he went out of his way to get her and Brad Pitt a wedding present.

It's not that that he doesn't want to get them something -- it's just that ... well, watch ... he explained it at LAX on Friday.

BBT also says it would NOT have been weird if he got an invite to the big event -- though he plays it coy as to whether he really did get the nod.