One thing you need to know is that they might lie now but, that shows that he/she has got some respect for you (i'm not saying lying is good but sometimes it proves its worth in a way). For example (mainly for the ladies, may apply to the guys), you hear he cheated on you and when you ask him he denies it. Well for me it could either be two things: He knows it was wrong for him to do that and knows how hurt you would be when you find out and so he won't admit it then because he cares about your feelings or he just doesn't give a dime about you. Besides no one is perfect mistakes are bound to happen. By the way, it is what you give to him/her you get back so be careful on how you treat him/her.
Anyway, back to what I was saying. You just have to give the person time to come clean because eventually the truth will come out sooner or later. Also, don't be to quick to break up when you hear the truth, you need to hear the other party out. Following my previous example, I know that will definitely hurt but there's more to it than just break up and i'm talking from experience. You have to give him a chance to prove himself because when you met this person i'm sure he/she had their past and that may not be easy to let go and so it's going to take time to get that out of the way. The question is have you got the patience to wait??. Help him or her! not saying change them because that's not easy that is something that will happen as you carry on with the person. A lot of people think it's not easy to change someone. Well, in my opinion that's because you have not given them a reason to. Cause when you do, they will change!. Believe me.
One more advice: Whenever you hear anything about your partner outside don't be quick to judge, defend him/her and when you get back home sort it out. Because i'm sure one of you if not both of you have got haters and they never want to see anything good come out of the relationship. So, if you're too quick to conclude and just end a relationship only to find out it was a lie? well.....YOUR LOSS. So be careful ladies.
I'm going to talk about Forgiveness, Happiness, Laughter and Fun in my next post so keep reading.