I made a new account at a job-search website and uploaded my resume to it. I received a call the next day from my manager: he was very angry, disappointed etc...

He made a lot of comments to make me feel guilty, evoking how generous he was by accepting me and taking the risk, or paying my studies even if the sum of those isn't a very high figure (could've paid that myself, I am still grateful). And he felt it was very ungrateful and inconsiderate that I was "looking for another job." I don't know how he found out. I'm guessing that HR is always looking if an employee made an update and informs management.

My response was simply that I made a new account with my resume and that that doesn't mean I am looking for another job, that just means I am open to new proposals. I offered to get a drink together later in the week and discuss it more calmly (we don't see each other every day nor talk to each other) and he accepted. We will meet later this week for an evaluation and performance meeting with the client. 

How could I handle this without constraining my options?