been cheated but , working through it

[LOLO D.]

ill try to make this short as possible. my fiancee went home to virginia to see family last year when i was 8 months pregnant. about 6 months ago he confessed that he slept with another woman while he was there. i was discusted and devistated. how could he take a chance on losing his family? why? what did i do wrong? whats wrong with me etc.
since we have been working very hard to get through this. however two weeks ago i got nosey and found out that he slept with a neighbor a couple years ago. he said he hadnt told me because he didnt want to hurt me more than he already had. I am trying so hard, we both are. we are able to communicate and have our good days. some days feel like im spinning out of control. now we have a baby and i feel like his (fiancee) actions have taken away so much of the joy that i should be feeling right now. sometimes its hard to get up and face the day. I know that there is a lot of rebuilding and i have decided that i am up for the task. i feel that he understands the pain that he has caused and that the stakes are high.
i am open to any advise, please be positive. i also have some good advise to give.
thanks for reading
laurel