Vikings preference: your friend hits on you and gets aggressive
Ragnar Feels genuinely hurt because he thought he could trust your friend. Whenever Ragnar went away, he'd ask your friend to keep an eye on you and generally make sure you're safe and sound. Makes veiled threats and passive-aggressive jokes at first, hoping that he can both force a boundary and not sour any relationships but his humour is gone when he realizes that your friend is not keen on taking no as an answer. If you raise your concern about "safety vs. keeping a friend", Ragnar makes a sarcastic comment about your sentiment - because a guy who forced himself on you is such a great friend to keep, right?
Gives you a knife to keep on you at all times. If you have the guts, and such an occasion arises, to stab the man once he gets physical with you, Ragnar will have your back no matter what. Also, low-key thrilled. But if you don't end up fighting your own battles, he'll gladly do it for you. Not an ounce of regret on his face during or after.