I’m dating a married man

So I’m dating a married guy, we’ve known each other our whole lives. So for about 2 years we’ve been dating each other while he’s been married. But our situation got a little complicated his wife is currently 16 weeks pregnant and we (him and I) found out that I’m also pregnant about a few days ago. He doesn’t want her knowing that him and I are pregnant. But the situation feels weird and i don’t know what to do. Should she know about me?

To update on the negative comments. He was planning to leave her anyways. The only reason why he hasn’t told her is because that’s his child at the end of the day and he doesn’t want to upset her. But his family knows about me and so does his friends. She’s the only one that doesn’t know that’s why I’m saying I feel like she should know so she can decide for herself. To clarify his family has been known about me since we started dating two years ago.

Another update for the haters in the comments. For one I don’t have any diseases, most of you are just hateful and just quick to judge me. I’m not the only one that was doing bad here. Do I think it was it was okay getting involved with a married man? I think so because we have feelings for each other and his family loves me. No one has the balls to tell his wife that he’s been with me this whole time. So yeah I came on here to ask for advice if I should tell her because clearly no one has. Yes he’s planing to leave her even his family bows that. She hasn’t seen his family since him and I started dating. I’m the one spending holidays and such with his family. I go visit his mother about 4 times a week with him. We always discuss him leaving her. Does it’s bother me that he’s been sleeping with his “wife” no not really because I know pretty soon he’s dropping her. Yeah maybe she deserves better because he has feelings for me, etc. But I know where him and I stand. So for the women who continue to say I’m playing myself or he’s not leaving, y’all don’t even know half the story and if you women knew how she was you wouldn’t be so quick to judge. She had an affair first he forgave her. A few years went by and then he decided to reconnect with me. We started to hang out as friends like we always have because he’s been having trouble in his marriage. Then we started dating, his family notices how happy he is with me. Is it ideal that he got her pregnant no, should he have left her a long ass time ago? I agree, but that’s his choice and I don’t have a say in that. All I was asking was for advice saying if I should tell her because no one has the guts to.