I think there's a lot more to this than just techniques for trust building since you're trying to recover from trust being broken, possibly intentionally; it's much harder and may be impossible.

To answer this properly there's a few bits of information people will need to know:

1. Were the violations done by this particular person or someone else?

If this partner committed them it's likely not possible to fully rebuild that trust. It also may not be safe to try depending on:

1. Were the violations willful and intentional?

If the violations were done when he had full and clear knowledge of your limits and boundaries, and they were not done by mistake. By "by mistake" I mean it happens and then he instantly apologized and safe worded out of the scene to discuss with you and let you both address the issue (yes, dominants can, should, and must use safewords to end a scene if there's a risk to their mental health or something happens they feel shouldn't have). If it's the kind of "by mistake" where you have to bring up the issue after and he uses that as an excuse it's not really unintentionally done. If there was something else going on:

1. Was there a gap in communication you've since closed?

If the mistake was that he was confused about something you tried to communicate but you've since discussed and rectified that then the process is likely more similar to a typical trust building. It's really important that as part of this you go througheverything that might happen during a scene and discuss it in annoyingly specific detail. I have a sheet to aid in this but it still has some gaps. Specifically I don't break down the body for each item and agree to it by body part. I also don't have a general "touch" listing because of this. The gap is pretty much entirely because I'm open to everything everywhere that any professional would feel safe doing it and it's geared towards pros.

1. Were they total and obvious accidents?

This is the easiest as it's clear it wasnt on purpose. The most recent one was during a wax play scene where a few people were slapping the wax off of me while doing some face slapping I was writhing around and someone caught me ear. I yellowed, we paused, checked I was unhurt and okay to continue and then moved on. Everyone sas aware, we dealt with it right away, and moved on. I also checked in with them the next day to make sure they were good with everything and that they were emotionally okay.

Beyond that the biggest thing that builds trust between play partners (of any kind, relationship or not), is the ability to communicate and adjust immediately. Doing smaller scenes and building up and giving you space to use all of your safewords (Green/Continue, Yellow/Pause the scene to address an issue, Red/END EVERYTHING NOW!) and have them respected and have the other parties reward your use of them with more trust in you that you will work to protect yourself in-scene.

When you get into CNC play and other edge play you move into the domain of RACK & PRICK (Risk Aware Consensual Kink & Personal Responsibility Informed Consensual Kink). If both parties aren't fully aware of the risks of the play, fully aware of the fact that unintended things will eventually go wrong the more you do these things, and have the maturity and presence of mind to knowingly consent to them then you can't do them consensually. At the same time both parties need the maturity and awareness to be fully present in the scene, to hold themselves accountable for everything that happens - intentional or unintentional - and willingly and fully accept the consequences of that; if not then you also aren't truly consenting to the play, because both parties don't see themselves as responsible for the outcomes.

If you read this and don't see your partner in a way that they can handle this, and that they will ever really be able to hold themselves accountable first, you need to find a new partner.