Cheating wife, advice please

we have been married 8 years. I found out last week that my wife has been seeing someone from her work. only found out when the mobile phone statement came throu, both our phone are in my name, so didnt think twice about opening it. mine was the usual 2 pages, but hers this time was nearly 40 pages. over 400 texts in 1 month to same number. confronted her, confessed straight away, apprantly been flirting and texting for a couple of weeks, then 'did the deed' in an disused part of the building 2 weeks ago. but claims it happened only once, but the texting continued at a higher number each day. we have tried to sort things out, but she expects me to 'get over it' straight away, but i cant, still very raw. at the time of the confession she was so sorry etc, etc, the stuff that cheaters that have been caught normally say i guess. but now she is so aggressive to me, blaming me for what she did. i love her with all my heart,she says she loves me. i want to move on, but its to soon. what makes this more ackward, we have a 16mth old girl. and the house was bought jointly with her parents, so all under 1 roof. i just get the feeling that im being strung along just for my pay packet. i cant bear the thought of being without her, but she is not making it easy. my head is so screwed up, need help.