My guy friend just texted me saying he saw my boyfriend with another girl!

So I’m currently getting ready for my date with my boyfriend (let’s call him Evan) and I’m already set. My guy friend (let’s call him Eddy) texted me and told me he just saw Evan with another girl and sent me a photo. He’s at the store. He just took a picture of this back and the back of some girls back. I told him it could be anybody and people can have the same jacket. Eddy said he knows what he saw and he really saw him with another girl!
That’s impossible because he told me he was going to be a bit late and out date for postponed until 5pm. Then Eddy said that’s because he’s with that girl and he’ll be over to talk to me about it soon. I got irritated with Eddy and said I’ll talk to him later.
Man why is Eddy tripping. He doesn’t want any guy to date me! So selfish!