I have been with someone for quite some time but haven told her about the MS. In that time Ive even had one ON attack that have been able to keep quiet from her other than this have no symptoms. If she found out I dont know how shed react but I know she would take it very very hard.
How or when or even if should I tell her of this situation?
Since you are asking for opinions, I'll tell you mine. Honesty is key. If this person is special to you, they deserve to know. I know I personally would be VERY hurt to know my mate was keeping something so important from me. If you are worried this person won't stay with you after you break the news, that person is not right for you (IN MY OPINION). Good luck, and I hope you do what you feel is best for you.