Should I tell her this and break her heart?

Ok This Summer I Had Sex With My Friends Boyfriend [[We We Not Friends At The Time]]. But My Boyfriend Found Out That I Am Not The Only Person That He Cheated On Her With. He Cheated On Her 7 Times Including Me. And He Also Does Drugs. And She Knows It....

But Doesnt want to Believe It. But Everybody Knows It. I'm Still Really good Friends With The Guy And My Friend Because We Both Lied About It. But I want to Tell Her The Truth And He Doesnt want to Tell Her. I Want Her To Know From The Person That It Involves Not Someone Else Should I Listen To My Heart Or Should I Listen To Him And Not Tell Her And Keep Her Happy Not Knowing Or Tell Her And Break Her Heart.

You should definately sit her down and let her know what happened ASAP! She will eventually find out about it, and it would be better to hear it from you right now! If you value her friendship, you have to get up the courage and just do it... maybe you could let her know when you or her are spending the night at one of your houses! Be sure to tell her about all of the other girls too! She might be upset at first, but she will eventually appreciate someone finally being honest with her! Good luck!

^^Agreed with heathershaw. After all, what if she finds out about it from someone else? Honesty is (almost) always the best policy. Even if it hurts others.

Tell her if they eventually go to the next step in their relationship it would be a mess.

Tell her, You have to.
If you don't tell her, and she finds out in the long run, you're going to be in more trouble then you would be if you told her now.

And BTW: PLEASE Dont Type Every Word With A Capital Letter Like I Am Doing Now, It Is So Annoying And Makes It Hard To Read!!

you should tell her..
she has the right to know that her boyfriend is cheating on her.
what happens if she finds out by herself, then you may lose her as a friend.