Abandonment is not mere separation but when one spouse leaves the family and the conjugal dwelling with no intention of returning under Art.101 of the Family Code. Hence, there is a complete cessation of marital relations between husband and wife, both personal and property, as well as parental relations with the children.The abandonment must be without justifiable cause and the abandonment must be for more than one year.
You should file a case of child support if you want to get him to give financial support to your child. Regarding the immorality issue, you need to prove your assertion that he is maintaining a mistress and living together but did not contract marriage, this is sexual infidelity.
legally speaking, you can file a complaint before the Association of Nurses, however you have the burden of proof to show that indeed your hubby has committed such and sanctions maybe given if you can convince them of your claim.