Idk what to do

This is going to be long so I apologize I just need to get some stuff off my chest. So my boyfriends friend let’s name him Dave. Dave is known to hookup with other girls. Dave and his girlfriend and their 1 year old daughter live together. After all of Dave’s mess up his girlfriend still manages to stay with him through all the bs. Now the second person we’ll name her Ana. Ana is my boyfriends co worker. She is recently divorced and looking to have “fun.” Ana is currently fucking her boss. The boss yet has a gf and a baby on the way. Now my boyfriend and Dave went out tonight since they play in a pool tournament. My boyfriend called to check on me then he says: “ send me Anas number so i can hook her up with Dave.”

Me:Why? Isn’t Dave with his gf?

Him: You know how Dave is just give me the number so I can hook them up.

Me: But he’s in a relationship with his gf? I’m not giving you the number

Him: It’s ok it’s just Dave it doesn’t matter.

So I hung up and didn’t give him the number for “Dave.” Now I know how it feels to be cheated on and I know it’s none of my business but I can’t sit here and give him the number just because “Dave” could use a hook up. And to me that’s just disrespectful. My boyfriend disrespected me because he’s ok with his friend hooking up with other girls while his girlfriend is sitting at home smh. Now I do believe the people you surround yourself with do have an affect on you. In a way I feel like my boyfriend can cheat on me. I used to not worry about this but now I’m afraid he will. I shouldn’t even have that feeling. I should feel like I’d always be the only one but I’m afraid he will cheat on me. Maybe I’m overthinking it but I will not give him the number to give “Dave.,” just so he can get a nut in. If you don’t love the person the way they love you just let them go. Hiding it and cheating will only make it worse for them.