You say you already had one issue with some other person, but could not conceive with the man in refference even after 10 years of contact, while the same person could impregnate another woman.
This does not essentially mean that you were at fault, & you can not conceive any more. Please don't worry. There are few things which can cause imfertility in certain couples, like-
_ The person might have had treatment ,there by improving his sperm count/ motility/live sperms.
- The lac of psychological involvement in the couple / dislike of a perticular partner can turn into lac of sexual desire/ unsuccessful conception.
- The vaginal mucus of a lady may produce antibodies
against a perticular sperm ,thus failure to conceive.
If you are eager to conceive, please get yourself checked up by an expert Gynecologist,& treatment if needed,before you try for it.