This post bears repeating:
and bolded for emphasis

I don't want to be the bad one here but I remember when you found out you were pregnant.  

You both had unprotected sex, not just him....

...Your pregnancy can not be blamed on the father.  You got pregnant.  You knew you were having unprotected sex.  Women are responsible for their own actions and bodies.  You could have insisted on a condom or refrained as you were not on the pill.  

On the upside, you have the most beautiful little son.  I am sure he will be a constant joy in your life forever.  Many of the most treasured children have been 'mistakes'.  

Please don't be angry at men for 'getting' women pregnant.  A women gets pregnant when she doesn't take responsibility for her own body or actions.  

I do hope you can take 'dad' to court to get child support.  He is the other half of the equation and should be held responsible.

Sorry if I have offended you.  I just hate men to get bashed for pregnancy when there are two people involved having unprotected sex.  If a man is to be blamed, that means women are stupid, in-superior and ignorant.  Women are none of the above.

Love your little boy.  He really is a blessing as you never wanted kids.  Now you have one and love him to bits.  He was the silver lining in a cloud.

...I don't know what You said, SQ, now that the post is deleted.... but the advice given here is all of great value.
I understand why You resent the father of little Mike, being the irresponsible turd that he apparently is... You have taken responsibility for Your actions and decisions, and it sounds like You're being the best mom that Mike could ever have, and I am happy for You.

but really, make sure not to spread Your negative feelings especially around Your son... it can be psychologically damaging, and he may grow up resenting older men/father figures because of it... just do whatever it takes to get Your "friend" to pay child support, and continue being the loving Mommy that Mike deserves.
:-*