"i have found out that she has been cheating on me around 3-4 weeks ago.. confronted her, she admitted it and i took her back.. over the last few weeks she has continually hurt me going back to this other guy"
Wow dude . . . I suppose the only reason you allow this is for the child. . . is that child even yours?
"She has now finished it with him"
Lol, sure . . . nearly a month and then she's done . . .she should have been finished from the start
"i cant trust her anymore"
If you can't trust her then you don't have a relationship
You post, you ask questions, you give facts --> I reply, I give quotations, I have opinions