Pining, Advice?

So I am in a relationship of nearly a year and 8 months. There has been some serious problems in the past but we have managed to really clean up our drama and be a couple again recently (like a week recently). The issue I have is that I'm totally pining after someone else. It's the stupid crush stuff but it's happened with 2 people now. I love my boyfriend, so much, but for along time I thought seriously about getting out of the relationship because of how toxic it became, and now I'm fantasizing about people I know would treat me better. People that me and my boyfriends issues would have never happened with.

The first person I started pining after was my age and in a relationship. I have known this person basically my whole life and it wasnt the first time I crushed on him so I just blew it off and it went away. And it has, truly, mostly.

This other, new person is 10 years my senior. An adult that has been a part of my life for a while as a mentor and friend. Obviously, there is no way in hell *that* is happening but I just cant stop thinking, 'this person would treat me so much better'.

Either of them would.

Any advice on how to cure me? I do love my boyfriend and just want to know how to get past all this.