From a multidimensional perspective the whole notion of an “ex-partner” is total nonsense!
This term applies only in a separate third-dimensional reality based on linear time.
There are no ex-partners! There are only partners and that’s it!
All the partners you have had in this and other parallel lives continue to coexist and relate to you, no matter how you pretend you are alone or with another partner.
Although in strictly third dimensional terms it may be advisable to relate to only one partner, if you believe that all the other partners you have had and that you will have will cease to relate with you and you with them, from a multidimensional perspective, you are being delusional.