Just like not letting your partner know everything about you, just being an open book could also cause problems in your relationship in long run... but, there should be an idea of what to tell and what not to your partner... here is an attempt to make you have an idea about what could be the aspects that your partner has to know about you;
Marriage is a lot different than when you two were dating. The "honeymoon" phase is over and life may seem to have gotten a bit on the monotonous side. You may face the same routines over and over again and feel a bit on the trapped side. It's OK to have these feelings. I'm sure all married couples go through the rut of monotony at a point or two in their marriages. But if you really want the marriage to work you have to open up. Again I point out the communication skills you were born with. Your spouse will never know how unhappy you really are unless you open up and tell him. There is nothing wrong with being open and honest about your feelings.
Opening up about being unhappy is a good way to express what you want, and where you want your marriage to go from here on out. And the man who vowed to love you through anything will respect you more for coming clean.
So talk about it before the distance separates the two of you. The key is to bring up the touchy subjects like boredom and resentment before the damage is done. And act quickly, no matter how much the subject hurts. It could resolve a lot of issues for the both of you.
If the topic of sex is iffy with you, then move on to the next segment. But ladies lets be a little bit honest here. Faking it at times is OK. Faking it ALL the time is not. We have all done it at one point or another in our lives and even, I'm sure, with our spouses. But if your sex life is so unsatisfying that you are faking it all the time just to "get it over with" then you need to sit down with your spouse and talk about it.
The topic of sex isn't something we want to sit down and discuss, especially if it is unsatisfying. But the issues should be addressed if you are not being satisfied by your partner. Don't feel like it's your fault that you can't climax, or that it might embarrass or hurt your husbands feelings. Talk with your spouse about the possibility of introducing new techniques or positions to spice it up a bit and help you out in return.
Events that are traumatic, be it in childhood, college, or life before your husband, don't always affect us at the exact moment they happen. The trauma of an event could come when you least expect it. So hiding something that happened to you in the past from your spouse could come back to tear you apart later in your marriage if you don't open up about it now.
I know things like sexual traumas aren't something most women are ready to tell their respective spouses about the minute the engagement ring is on the finger. These topics are very touchy and sensitive. Often enough, the only thing keeping a woman from telling their spouse about a past abuse or rape is fear. Don't feel embarrassed about opening up to your spouse. And don't feel like you'll be judged either. Your husband is your teammate and should be in your corner no matter what. Ultimately hiding these kinds of secrets can cause undo stress on your marriage and drive the two of you apart.
Just give your 100% in your relationship… if works, nothing like it and if not, then please remember nothing of these is the end of your life…