My (28M) boyfriend (31M) is jealous of my friend (26M) becoming a dad

My boyfriend is jealous of my friends baby and has been asking for reassurance a lot lately. My boyfriend and I have been together for 3 years, and we meet through a mutual friend, my friend Callum (26M) who has recently had a baby with a friend of his.<br><br>Everyone is very aware before I started dating my boyfriend that he was my friend first, and vice versa. It was a natural progression from close friends to boyfriend. <br><br>Callum is also a very close friend of mine, and even though he’s very busy with his new baby we still message and talk regularly. <br><br>My boyfriend is now questioning everything now, and our relationship is suffering. He keeps bringing up the fact I was friends with him first, and even went as far to ask me off I still had feelings for him. <br><br>I don’t. I’m happy for him and his new baby, but I do not have romantic feelings for him. I don’t know what to do and I’ve reassured him a lot that I love him and I’m not attracted to him. <br><br>What’s the next step here? And how can I reassure him of that when he’s convinced I’m still in love with Callum?<br><br>TLDR: Boyfriend jealous of my friend having a baby because we were friends first