Taking the first step?

Spooners

How do you do it?

It looks as though my FI and I (been together for 10 years) are slowly falling apart. He feels like he has only been with me for the past few years to make me happy while he hasn't been himself. He "loves" me, but feel he could love someone else more. While it hurts, I don't want him to be miserable, and I think he is. We have been in counseling for over 3 years and it has helped tremendously. However, once starting new medications for his depression, he has a new sense of awareness of his feelings which started this whole thing. 

We have one daughter who is almost 5, and our second daughter is due next month. While it's really crappy timing, how do you take the first step?

I've been a SAHM for the past year and half and have NO WAY of supporting myself and my kids. Staying with family and friends is NOT an option. I'm scared shiitless. No one knows and I don't feel like it's anyones business at this point. WTF do I do?