Should I tell her I cheated on her?

Lastnight I got a lil drunk and ended up cheating on my girlfriend of 14 months. She did the same to me a long time ago and didnt tell me for a while. Should I tell her? I dont wana loose her

It's scary to tell someone something like that, but it is for the best. If it comes out later on for some reason it will be a lot worse.
Don't use being drunk as a reason when you tell her though. You can mention that you were drunk and that perhaps it clouded your better judgment, but don't use it as a scape goat..
I think the best thing is when people own up to what they did...and don't use excuses.
It's kind of like the 'but' theory..that theory is when you make a statement..and then attach 'but'...I did it because...
It's kind of like...forget everything I just said before the word but...this is my excuse and why I cant be held accountable.
Maybe because she did the same thing she will be more understanding about it, maybe because you are owning up to what you did, she will respect that you were honest...
and in the future...try to make decisions..both when sober and drunk that won't leave you hoping that you will still have a girlfriend after you tell her what you did..

Good luck

well I don't think you cheated because you were drunk that is no excuse. when you do something when your drunk its because you were thinking of doing it when you were sober. I would tell if she told you when she did it just be honest. if you let things out in a relationship then your future with will be better

Not immediately because it would make a sense of that this was a revenge and now you are triumphing. Let's say wait the same time what she waited when she cheated on you. Cheating happens in the life, in certain sense it belongs to the life, both of you have to know how to deal with it. Do not make a big problem from it, but even do not ignore it totally.

yes, you should tell her, honesty is the best poilcy and if she finds out through somebody else then she'll be even more ups et.
if she did a lil ewhil ago then she should understand thoug, infure , dont sleep with somebody else

Yes, tell her a/s/a/p. If she's not going to forgive you like you forgave her [when she's the one in more trouble for taking hellla long to tell you] then trust me, you don't want her anyways.