MY GUY LEFT ME FOR 2MONTHS I WAS 5 MONTHS PREGNANT AND HE CHEATED WITH MORE THAN 4 GIRLS 1 WAS PREGNANT also?

i have being in a relationship for 3 years my fiance has left me 3 times I would wake up and see a letter saying good bye his mom does not like me at all,on january 29 2008 he drug me with tylenol PM and when I woke up he was gone he left me no letter no nothing,, I was 5 month pregnat at the time just went I was moving on 3 week laters he calls me from Colombia saying how much he loves me and miss me... I was pregnat and alone so we started talking.. I send him 500 dollRS so that he could come back he spent it over there with his girls I almost lost the babie because of all the stress he din't care in April 2nd a bought him a plane ticket $780 he came back that same day he was saying good bye to all his girls>> You ask how do I know all this I told him that the only way our relationship can work it was if he confess and he did and more I can't trust him and my friends told me to forget the past and focus on the baby 11 days old today.. but it has being hard on me.