Should I Separate from my Husband????

We have been married for 4 yrs but together 6. We have 2 girls, 5yrs and 5mos. We got pregnant and engaged 3 mos after we met and married 11 mos after my first child was born. We are really good friends as far as going out, playing games, joking around, etc.. But as a couple we don't agree on anything, especially how we raise our kids. In addition, he doesn't pitch in how he should. I work full time and he works PT as a bouncer 2 nights/wk. He has a lot of drama w/ his sons mother and just got out of jail (2 mos.) for non-payment of support (although he wasn't completely in the wrong). He does not get along with my bro and sis who I love dearly;I couldn't even invite them to thanksgiving and he doesn't want them @ our daughters bday party. He has really let himself go and I am no longer physically attracted to him. I make love to him b/c I love him but not b/c he turns me on. We just talked and he said we should separate, but I don't think he means it. I yearn to be free but am scared.