I don't know if it's self-injury specifically as a term, but it would (probably) fall under the category of "destructive behaviours".

If you let other people hurt you because you feel you deserve it... that's one thing.

If you let other people hurt you because you like the feeling of pain (like massochism)... that's another thing.

If you let other people hurt you because you don't want to hurt yourself, but feel you deserve to be hurt and use someone else as the "force" to do it... that is also another thing.

It depends on things... people from an abusive background of any sort can perpetuate the cycle and keep going back into that same sort of situation with many people ... because they feel they deserve it, and/or it is all that they know and it seems like a normal behaviour/pattern.

I'm sorry, I'm not really answering your question... I seem to be asking you more questions for you to ask yourself.

But no, I don't think allowing other people to hurt you is a form of self-injury in principe/by definition as I've come to understand it. Just my opinion.

((((((((((((((damajdancer))))))))))))))))

If you need to talk at all, or have any other questions, you can PM me and I'm willing to listen and help if I can.