What can a guy do to overcome jealousy for his female friend?

I have this female friend, we have very plutonic friendship. One day we were hanging out with some other friends, I saw some sparks between her and my other guy friend and I didn't like it, I was getting jealous about it, and it looked like she couldn't stop thinking about him after the hangout and she tried to hide that from me for some reason, which kind of made it worse for me. I feel like I'm suppressing my feelings but I'm not sure how to handle it, this is new to me. What should I do about this situation?

What can a guy do to overcome jealousy for his female friend?
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