What's Mark thinking when he says "enough ... enough now"?

In Love Actually Mark was in love with Juliet, but he couldn't tell her, and now she's married to his best friend. Since it's Christmas he finally tells her (with cue cards). He smiles, and leaves ... but she runs out and kisses him and runs back inside. He then says, "Enough. Enough now."

What the heck does he mean? What's he thinking? I love the movie and the "deleted scenes" on the DVD share a little more insight into Mark's damaged character. But I've always been confused about his line and his motivation.

here's the 20-second scene

Best Answer

I can only offer my own understanding of Mark's words here (even though I tried to snoop around Google a bit for an explanation, but no luck this time, maybe just this one site mentioning it briefly). Basically, what he said could be understood in two ways:

Explanation 1: He just got a kiss (even though more of a consolidation one than anything else, but still a kiss) from the girl he loves, which could start a lot of thoughts going on in his head. And since he knows he can't pursue her, because she's married to his best friend, he utters "Enough. Enough now." as in to stop the thoughts from swirling further.
Explanation 2 (one that I think is more probable): He utters "Enough. Enough now." as a decision that he's going to stop pursuing Julie from now on (because doing so would only bring trouble). Not a typical end of a love story, eh?