please help may be a new lone parent...

[slicer]

i cant believe im writing this but my partner has cheated on me. we have an 19month beautiful girl. he was drunk i was away. our sex life has been strained since the midwifes at the birth sewed me up wrong. why am i being punished? i never thought this was happen. im scared i wont be able to forgive him. i dont want to split the family. he already has a child from a previous relationship.
ARGH
any pearls of wisdom?

silly question I know but how do you know he has cheated, has he told you?
You must feel very low at this point with such a small child and the problems from delivery
Do you have enough support? Have you seen a gynaecologist doctor recently? Betrayal and physical problem are 2 different issues but I hope you can at least find reassurance that you are ok. It may be matter of time I am sure things will mend (with your bits, not with him)
What does he says?
Why did he spilt with previous partner and how long after the birth of the child?
History repeating.......

he has told me eventually that he thought he might have! its a mess but i've opted for the messy bohemian lifestyle. the best that can come out of this situation is through counselling and a big slap of reality hitting his face will shake us up into a better relationship than we had before...
i owe my daughter and step daughter at least one chance at forgiveness...
thank you for your support