Beautiful Teresa, you story is all too common I am afraid. I feel for you as many on this forum do also. It is sad when people play with each other's feelings, lead them astray, make them think they are the only one, when there are others, one or more, probably thinking they are the only one also. I know of one other person on this forum that it has been happening to.
If the guys or gals are playing the field they should be honest enough to let the other person know that, that person is not the only one, and then it would be more honorable, not that it would be ideal, but for some, they want to write to several, but they shouldn't pretend that they are only writing to one, and let the other person build hopes on them.
Don't give up because there are good people out there who will love only you. Keep posting on here, and I/we hope and pray that you will find someone who is true for you!
