Newly single mom needing some guidance

I’m a newly single mom and I need some help trying to figure everything out.

My ex and I are on good terms, more like friends. He cheated and we are not together. But we live in the same house until after I have this baby and we have a 2.5 year old.

I’ve been feeling extremely lonely and sad that I never wanted to be a single mom and was forced to make this decision.

I’m having trouble looking forward to the future and not looking back.

We’ve had some amazing memories together and he’s truly my best friend, we just are not meant to be and it’s so hard.

How do you guys do this?? Was it hard? How did you manage?