http://www.womansdivorce.com/florida.html#LAW
http://www.divorcecare.org/findagroup/ Local support group
http://www.18884mydivorce.com/pub/Misc/Legal-Separation.htm
http://www.flcourts.org/gen_public/family/self_help/map.shtml
So the marriage has broken down, he has committed adultery and possibly put you at risk of getting AIDs...which in the UK would be a criminal offence.......
What can he do if you pack his bags, change the locks and kick him out? if he makes a scene phone the police, he won't want them involved....Hope the websites are some help...if you fear what he may do then domestic violence is also something you tell the police, getting a court order for him to keep away.
If you are married in florida, you can't even change the locks.. The only thing you can do is leave. Find family to go live with and take your child. I live in Florida, Been though 2 divorces and trust me.. I wanted her OUT and it was illegal according to my attorney. They have to agree to leave and not have the keys. Since you are married, it doesn't matter and you can't keep them out of something that is legally theirs. Best advice I can give.. Leave!