She wants you to date her in a month?? While she plays the field meantime?
LOL, are you fuking serious? Hahaha, she is leading you down the garden path, boy.
Don't marry this woman (no lady, she). SHE cheated. SHE should be the one dancing for you. Begging you for forgiveness.
OMG, grow some balls right now & dump this tart to the curb. She doesn't deserve a nice guy like you. She's a bitch. Find a nice gal who will love you and provide a stable home for your child when your nutcase finance loses it b/c you won't take her crap anymore.
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh