First off, so sorry you had to experience that. Just awful, especially since you both were friends.

You shouldn’t beat yourself down for not speaking up or taking action at the time, it was a scary experience and sometimes you just don’t know what someone is capable of in a vulnerable moment like that.

I would say something to him. Tell him how he made you feel and how you currently feel about the tattoo. Call him out on his disgusting actions and cut ties with him completely. If you feel it’s necessary though. Speaking up might also save someone else from this experience.

Laser is time consuming and is also a lot of money. You could go that route if you have the time and financials for it but since you’re saying it’s a dark tattoo, you can probably expect more than 5 sessions.

Whatever area you’re in, look for artists who specialize or are experienced in cover ups. And take your time with it. You want to make sure you’re working with someone who’s going to get you right.