No strings attached, that was the code you and Jango made all those years ago when this little game of cat and mouse began all those years ago.
You and Jango were one of the most feared and skilled bounty hunters of your era, always taking in jobs and completing them with no difficulty and strings attached from the dead that have no reason to come back to bite either of you.
It was always the issue of wanting to one-up the other, which always resulted in either trying to fight to the death or being cordial with one another during missions. And maybe it was his cool demeanor or it was your witty personality, but those deadly matches could become lethal to one's heart when it took no more than a few missions to be in one another arms.
The up-and-down relationship you two had lasted for quite some time and often came at the expense of risking exposure if such words came out. That's why he had never contacted you, nor had you contacted him when the time came to finally just be done with it and part ways.
It was either by coincidence or Count Dooku had some insight into the previous relationship you two had but paths crossed once more. It was on Kamino, where you had also been given an assignment by the count himself. Work alongside Jango in overseeing, and if possible, covert a squadron of your own, and train them to be lethal and obedient soldiers.
That's how you had come back to Jango's life, it was easier said to get along than it could be done, even with how cordial you two have been since you first arrived at the watery planet of Kamino.
Not a day goes by where neither of you would pass the other in the white dome city, as there were no other humans or any humanoid species that came by this planet far in the Outer Rim.
At least there was his clone son, who was always curious but so desperate for friends on this watery planet. It's how you had first come across the unaltered clone on a rather lukewarm rainy day, where Jango watched you speak to Boba, from a far distance, observing the scenery.