It's a terrible thing that you have done OP. I know you are hurt, (many of us HAVE been!) but there is no excuse for this.
I used to know a couple who were in their mid 40s. (Let's call them Lisa and Steve.) One day (back in the late 1990s,) the landline phone rang, and Lisa picked it up, and a girl's voice came out with 'hello, Mrs Osborne?' She said 'yes?' The girl said 'I think I may be your husband Steve's daughter. He left my birth mom 18-19 years ago, and I have been trying to track him down. All I know is his name is Steve Osborne, and he is from Hertford.'
Lisa said 'Steve doesn't have any 19 year old daughter, we have been together 25 years since we were 20!' Who on earth ARE you? And why are you saying this?!' The phone went dead.
Long story short, this caused a MASSIVE load of trouble and upset, as Lisa, had this nagging doubt that this girl WAS her husband's and he must have had an affair. After 25 years together, their marriage started to hit the rocks, and it never recovered. The trust was gone even though he had never done anything, because of this call from this girl saying she thinks Steve is her father. 2 years later, they split.
No idea who the girl was, she was never seen or heard of again, and they surmised that she must have got the name out of the phone book (no internet then.)
This situation (of Lisa and Steve's, AND the OP,) is kinda like the episode of FRIENDS where Chandler drops it out to Rachel that Ross is in love with her, and she rushes to the airport, and tells the air stewardess to pass a message on to THAT MAN with a red scarf (she points at Ross.) The message says 'thanks for the lovely gift, see you when you get back, and we will talk more... love from Rachel....'
The air stewardess thinks she is on about the man in front of Ross (who also has a red scarf,) and tells him the message. His wife says 'who the hell is RACHEL?' the man doesn't know (obviously,) but it causes a rift. 2 weeks later, the same couple come back on a flight, and he is seen yelling 'dammit woman! I don't know any RACHEL, you gotta believe me.'
A bit of mistaken identity (causing humour,) in a sitcom, but this could happen, and DOES happen, and it causes awful problems.