You aren't bad swingers but we wouldn't play with you.
We are not in it for FF activities only. Your boundries would be confining to us. I suppose the difference is that we wouldn't have met you in the first place and would have let you know right off the bat we were not into just having the girls play.
Now if your add said you were 'working into full swap' or something then I wouldn't blame them, and I wouldn't blame them for wanting to move on. There are a lot of FF only couples out there (

) so I'm sure you will find something to your liking.
Honestly if you were looking to move forward beyond FF or implied that and took over a year to get there, you are moving to slow for most couples.
I'm also not sure if 'soft swap' really applies to FF only. Its a vague term but I'd think it meant partner FM swapping just no intercourse.
Final point is I doubt it was out of the blue from there stand point. They were most likely waiting and hoping you would 'come along' and finally decided you never would and gave up. It might have blindsided you but I'm sure its been building with them.