My Boyfriend Is Becoming Unreasonably Jealous And Bitter About My Sister’s Boyfriend. What Should...

My Boyfriend Is Becoming Unreasonably Jealous And Bitter About My Sister’s Boyfriend. What Should I Do?

We've been dating for 4 years now and before the last few weeks I felt like he was the best partner I could ever have. I won't go through a whole list of his qualities or what we've been through together so I'll sum it up by saying we click in a way I've never had with any of my exes. Which makes it all the more shocking with how weirdly obsessive and bitter he's been over my sister's relationship.
My sister, let's call her Ashley, is 25 years old and she's dating one of my old college friends Patrick who is 29 years old. I used to host a ton of get togethers and parties in my college days since my parents have a big house and my cousin would help me set things up. Through those get-togethers I made a tight group of friends which includes Patrick and that's how he met Ashley but back then it was just polite greetings and small chats between them.
Once I graduated my group drifted off and you lost contact with people. So I was a bit surprised when Ashley out of the blue asked me about him and asked if it'd be a good idea if she texted and ''tried her luck'' with Patrick, confessing she always had a crush on him.
At this point Ashley was close to being 24 years old, already working on a lucrative job and well is destroying it. So obviously I just wish her good luck and stay out of it. When my boyfriend found out he made a quip about Ashley being way out of Patrick's league but I figured he was maybe being a bit protective since he has become close with my family.It's been 5 months now and he seems so bothered by Ashley and Patrick's relationship. Making comments about the difference in their looks, how Patrick should be ashamed that Ashley outearns him, how there must be something seriously wrong with my sister's head for being head over heels for a ''loser'' . At first I thought something else was bothering him and he was just taking out those negative feelings commenting on other people's relationships but he's made it clear his problem is with Patrick. So I tried to give him the benefit of the doubt and guessed that he and Patrick were just like oil and water and my Boyfriend instinctively hated him and didn't understand why. But in his last outburst he said it wasn't ''fair'' somebody like Patrick got a great girlfriend without having ''to do any work''.
I've asked him several times now if he knows something I don't or if this more to this than what he says but he keeps insisting its just that he can't stand Ashley dating somebody he considers below her league and how its not right. Then when I tell him he's taking it weirdly personally he accuses me of having rose coloured glasses for my friend and how I'm not saying how this isn't good for my sister.

I'm not kidding when I say there's no red flags besides his weird obsession with my sister's dating life and before Patrick he didn't even seem to care. So I don't know what has gotten into him. What can I do and where do we go from here?
Relevant Comments:
Regardless of him having or not having a strange fixation with your sister's lovelife, to me it sounds like your boyfriend is afflicted with a rather toxic view of masculinity that might influence his own sense of self-worth. At least that's how I, as someone who'd say similar things as him once upon a time, understand it.
Are you sure he isn’t secretly into your sister and now seething that she’s with someone?
Also, what happens if you ever outearn him… if he is a bit concerned about why he views that as problematic or makes Patrick a loser.
Original poster replied, He's known for as long as he's known me as I introduced him to my family a few weeks into our relationship. In that time he's seen Ashley with other guys and never acted like this. So I don't think its because he's into her. I asked him what if I someday outearn him and he said it'd be different because we're already together. Meanwhile Ashley is lucky enough to be earning so well so fast and she's slumming it with a guy under her league. It's kind of twisted logic.

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