Couldn't post earlier since I was mobile and didn't remember my password
... What actually happened is I led out for 15k, and tankcalled his shove knowing I was probably behind... He showed sevens and I was out the door.
So littlegoliath's 3rd option was a fact, perhaps I should have bet less on the flop and then ch/called his turn bet and reevaluate on the river...
thanks for the pointers/replies, I went on finishing 3rd in a side-event of 800 € for 12k € after we made a 3-way deal and before the main event I finished 4th in a 220 € side so had a good week. At the moment also second on the Belgian Poker Challange leaderboard for some added value so very happy.