pregnant again. not sure how to feel about it

So I'm pregnant with baby #2. About 5 weeks along . My son is 8 months old. I don't know if I am ready for another baby. Either way it's happening though. I don't know how to feel. Because my S/O and I haven't been well off since my sons birth. We haven't been the same. We fight. I don't like even being around him sometimes. I don't wanna be with him most of the time. Because he's cheated on me multiple times. Nothing physical. But he messages other girls (MY FRIENDS including my younger SISTER. ) and asked them to fuck. He claims it's because he needs mental help and needs therapy, because as a child his brother molested him and his sister. Which.. I want to believe. But it's hard. I don't trust him. I'm annoyed as soon as he's around. And now, I'm pregnant with our SECOND child... I'm happy cause it's a baby... but it's just not what we need right now. We've been on the verge of ending things as it is... just confused and don't know how to feel.