I currently have 3 boyfriends.
I've known John for like half of my life and we were friends for a very long time before we decided to start dating. I had a few years where I was extra busy with projects and work so I encouraged him to date another person in addition to me. Originally, making our relationship polyamorous was to give him someone else to spend time with and to make him feel less lonely. After some failures and struggles, I encouraged him yet again by suggesting that he try asking out a guy who I knew he liked. Thankfully, the other guy said yes and that's how Arthur got in the picture. Arthur happened to like both of us, so after awhile I consensually got involved with their relationship (all 3 of us are bi) and now I had 2 boyfriends.
Fast forward to now, John and Arthur are a bit on and off. So sometimes we're throuple (a 3 person couple) and sometimes I'm dating them both but they aren't dating each other (in polyamorous terms that's called a v relationship). When they aren't boyfriends, they still mostly luckily get along really well and are kinda like best friends.
My 3rd boyfriend (he's pan) and I are in a long distance polyamorous relationship that started out as a long term friendship. He has some health issues and one of the times he was in the hospital, I wasn't sure if he was going to make it... I decided I wanted him to know how I felt about him and that lead to a relationship. My other boyfriends aren't involved with him. John also has another girlfriend who I'm not involved with. I hope that makes sense.
(Still don't have internet at home. Please be patient with replies.)