You have pointed to the effects, what you need to figure out is YOUR "why".
It is your pattern and there's a reason for it.
Now SBT does not deal with the "why". It deals with "know and choose differently next time".
Using SBT (DBing) means that the next time you feel you need to disengage, recognize that pattern and choose not to disengage. Or more likely, as you practice this, you will notice that you disengaged and then choose to re-engage. Eventually, you will notice it soon enough that you will simply not disengage.
Of course, that is in regards to anything from this point forward. This may or may not involve X2 (nor X1), rather it will be with ANY relationship.
It may or may not be valuable for you to understand "why" you disengage. Yet it could be valuable because your reason to disengage may also be reason for other behaviours in you that might be negative. So knowing the "why" and working through what ever that is... could be very valuable.
