I have a very affectionate lovebird.
If you have a good relationship, keep interacting with him, and it´s unlikely to change too drastically.
From my own experience, my super ¨tame¨ Jaime hooked up with the little more ¨wild¨ Aldora. He stayed the same. It helps her gain a little confidence around me as she will follow him to my hand etc
They are a true bonded pair, and my relationship with Jaime never changed at all. I like to back off and let him do his bird thing, but he does seek me out to interact with me.
edit; I forgot to add my second experience, my eldest, Sydney, hooked up with his girlfriend (Jaime and Aldoras daughter, Adélie), and he also stayed the same, as did she. I had very close relationships with both of those birds, both super tame, and both exactly the same now as a bonded pair as they were as singles.
Maybe others will have had different experiences, but those are how mine went
A good tip is to use the quarantine period to build as much trust as you can with the new bird, take advantage of the time alone together.