I have a clear doubt on my girl that she has been physical with some one else except me. But she is not telling me and there are many things which she has hidden from me about her. But I want to know because I love her a lot, so please help me its something serious about my life.

How can we know without a lot more information as to why you think she is lying, and cheating on you? How old are you both? How long have you been together?

INFO/INFO/INFO/INFO/INFO/INFO!!

Your post is a bit unclear. Are you saying that you suspect that she's cheating, or are you saying that you think she had a physical relationship before she met you?

If it's the latter, then what business is it of yours? Her past is her past. If you plan to have a future with her, then her past shouldn't matter. Is your past squeaky clean?