Should I tell him??

So I'm in a terrible situation. So I got a message from a previous SO(hadn't seen eachother in 6 weeks and hadn't talked for about 2) so he texted me saying he missed me again and asked if I wanted to hangout. I didn't reply. I sat and pondered my split from him. I still knew he had a girlfriend and that he still wasn't leaving her (long story). So he cheated on me with her and then we stopped talking and then they continued to date amd he's cheated on her with me. So back to the main point. He's put me through so much shit and I've felt terrible I have had just the worst experience and he didn't give a single fuck. So on the phone we were talking and I lied to him to scare him and make him feel like shit. At the time I was not thinking of any of the consequences but now I feel terrible. I told him that my period was 2 weeks late(which it was) and that I got nervous so I took a pregnancy test and that it was positive. And that I couldn't have a baby so I got an abortion.He didn't really say anything for a long pause and then said to I'm sorry that really sucks are you okay. And that was about it. No nothing of sympathy just like a well fuck it. And I didn't know how he was feeling. If he was feeling like shit or just not caring. So he wants to talk to me again but I don't want anything to do with him anymore it hurts me everytime but I still love him. I don't know what to do because I told him a horrible lie and I don't know if I should tell him the truth or keep it to myself since we aren't talking... Help me please!