<human>: Can you provide a brief rundown of the text in within 3 sentences?

Ok so i dated my ex, lets call her Ally, for about 4 months. Its was a short relationship nothing too serious. While we were together we made plans to go to a concert and i went ahead and bought tickets for the both of us. Two weeks later we break up. Normal break up, we tried to stay friends but it just wasn't going to workout. Now the reason for this is a little more complicated but im not sure if its at all too relevant. 

So im stuck with the tickets. A month goes by where i try to sell even gift the tickets but nothing, still have them. During that time i started seeing someone else, lets call her July. Things got pretty serious really fast and July is now my current GF. So now i want to use the tickets and go to the concert with July. Should i just invite her and tell her i bought the tickets recently, with her in mind, or should i tell her the truth? 

Ally and July are NOT friends but they do know each other and share a lot of facebook and real life friends.
<bot>: Bought tickets for an event with EX. Would like to take new/current SO to said event. How should i do it?