Should I believe her? Why does she need time?

I think she wants time to explore her other options and when she is finished she will come back. With you talking to her and bugging her (as she calls it) she know that you are a sure thing. You want to make her comfortable so she will want to talk to you and what you need to do is start thinking about yourself and making your self comfortable. Think of your own needs and what you want out of life. I would not call her or txt her at all anymore. If she calls I would ignore it and if she sends you a txt I would wait awhile and when you respond just say you are too busy to talk. She will get it quickly and when she comes back because she probably will you need to think about if she is really what for your future.

Don't wait around hun--even if she is sincere, it is obvious that she doesn't know what she wants, or just doesn't have the heart to let go, even if she wants to move on. This is a no harm no foul--crap happens. It is called "life", let go without bitterness or anger, it only kills the spirit. Keep your chin up, date, and have a good time meeting new people. Miss non committal will more than likely come running back when she realizes this new guy is an a-hole, but you may have moved on to greener pastures, and will have the last laugh.

Wish her the best, don't look back and get on with your own life.

Usually when a girl "needs time" she's annoyed and doesn't want a relationship with you.

Of course she's scared about what you found out about the other guy because now she's thinking do you still love her, will everything be the same...If she says she needs time then you just have to leave her alone for a little bit until she calls you and says I'm ready to talk to you about what happened. If that don't work you should call her and say what's the problem and is there anything that you did wrong that made her do something with the other guy, does she need space...and talk about how both of you are going to fix the problem so you can get back together.

Their lying to you man it because she likes how that other dude touches her but he doesn't have something you have and she really doesn't want to make a decision...she wants you to wait around till she choses who she wants...forget that make a choice, you know what you want, tell her and if shes not on board let her go...5 years, 5 years dude and now she needs space what the devil is going on you guys should be married with two kids by now...