Ugh.. depressed

I'm 3 weeks pp. I can not eat, all I want to do is sleep. Me and my boyfriend are supposed to be getting married in 2 months and I also just found out he's been hiding a phone in the bathroom to watch porn. He's been lying to me about it. (I'm okay with watching porn, it's the lying that gets me). I hate feeling the way I do. I feel like I can't give my daughter the life she deserves. I feel like him lying is my fault for whatever reason. I can't do much of anything besides lay in bed and just cry. 😭😭😭