I really need to cheer up!

Im 22 weeks & 3days into my pregnancy & is no longer in a relationship with the father of my 2nd baby.. I recently moved out of town and havent had much contact with the father now that he believes the babys not his all because the doctors kept switching my due date. The emergency room told me when i first found out August off of my last guessed period because i had gotten off Bc so it was irregular but after a doc appt it was confirmed November 12th but now it's not his and then i find out he has a new baby on the way by his ex girlfriend im just so down because i dont wanna be a single mom of 2.. Ugh