How do I tell my uncle am pr*gnant for him

OK....so I'm in big trouble. So I finished SHS last year. There's this my uncle who I have been crushing on for years now. He's one of those fine uncles who likes to work out but he always saw me as a small girl. Until last year, he had been abroad for a while so when he came back he was surprised to see me all grown up. He kept commenting on my body and when no one was looking he'd press press me a little. I knew he also felt the same way so one day, I decided to take matters in my own hands. I wore the most provocative dress I had and went over to his place. I didn't even sit down before he started kissing me and we had s*x. It was surreal. We started dating and having s*x frequently. Last month I missed my period and I took a test and realised I was pregnant. My problem is how do I tell him because I'm afraid he'll leave me and I can't live with that. I'm thinking about getting an abortion