No matter what I do to reduce my jealousy, it just comes back even worse. 

My FP has a lot of friends, and due to this, I am constantly worried that they're talking to them over me.

Even with miniscule things like matching profile pictures or just playing games with their friends, it sets me off and I am sent into a panic. My jealousy makes me feel nauseous, too. So it's not just an emotional thing. 

When I feel this feeling of intense jealousy, I start to grow distant. My replies become short and choppy and sometimes I don't even reply at all. This has definitely caused a strain on our friendship. 

They're well aware of my jealousy issues, even complaining about it to me, so I've tried to mask my distaste to the best of my ability. Unfortunately, I feel like this made it much worse than it already was. I've tried to bottle up my feelings, but I know it's obvious when I'm feeling extremely upset. 

I don't know what to do. I feel lost and scared. I seriously don't want to lose this relationship. :(