Old Guy, New Plans

Okay, before I got with my fiancé, I had a fling with a family friend. We f**ked around for a few months or so and when I met Eddie (my fiancé) we obviously stopped. But we’re still friends (his mom and my mom were best friends so we grew up together). His mom recently died and so I’ve been talking to him more because she was all he had. I plan to go to his senior night baseball game, because he doesnt have anyone else. He wants to come hangout with my fiancé and I so i can meet his new girlfriend. I feel weird about it after our past, we haven’t hung out since it ended. My fiancé doesn’t know and neither does his girlfriend and we have an agreement not to tell anyone but I’m so uncomfortable. I feel like I’m cheating by making plans with him. I don’t have feelings for him beyond family-oriented love. Idk why I feel so uncomfortable but I do, what do I do???