Venting going through it

I am 8 weeks pregnant and my now ex has left me. Due to a rumor his ex who has their one year old son has made up. I slept with someone in the passed over two years ago and she is saying it happened now and I cheated which I never did. For my birthday the guy offered to bring me a bottle and I guess his gf found out which I had no clue about. This was about four months ago. Mind you I never met up with him and he never came over nothing happened he’s from my passed. My kids father that I’m pregnant by has left me. I really don’t wish that on anyone. I’m just so upset that she would even bring that up from so long ago. I denied it because there’s nothing to know there was no history and it was a one night stand I hate happened bc I’d liquor. I feel so lonely. Not even the father of my son who I really went through years of ups and downs put me through this. It’s so hard for me to accept I’m going to have a pregnancy alone. I’m so hurt.