Bring as much caution as needed, and remember that the risk of heart-wounds is for everyone involved -- unless you're dealing with world class creeps. (Don't even get me started about THOSE people!)
This couple that you were involved with were about to lose your close companionship before very long, as I remember -- as you're preparing to move back to England. This may be unrelated to what transpired -- but I would remind you that if they were able to remain utterly loving and open with you up to that ending ..., well, that would make them pretty remarkable human specimens. So it looks to me like it was gonna have some hurting and ending either way. And I say this with as much tenderness as I can bring to it, as well as the humility which comes with the fact that I simply don't have more than a faint hint of the complexities of your situation.