@SeverienBehets,
It's sad that 8 weeks later, you are still so worried about this.
Signals are hard to read at the best of times but in this case, he had been drinking. The Full Moon Party demands that right? Thousands of people drinking.. Off course, some fool once drunk is going to hit on a girl no matter who that girl is.
That is all you need to know.
Compliments are nice. Telling someone you have a boyfriend in my opinion is the same thing as saying "NO" it's making a statement, I'm off limits..
Two months is too long to keep dwelling on. All you are showing is that you love your boyfriend. This is not keeping a secret from him, per-say it's choosing to realise that this guy acted in the wrong manner, you told him so, he apologised and you handled the situation as a mature person, just be proud and move on with it.