<human>: Can you succinctly summarize the text in 1-3 sentences?

Over the last several months I have been becoming good friends with a guy, lets call him Tom. I have 2 classes with him, many mutual friends, and have gotten to know him fairly well. We talked on a regular, almost daily, basis. 

   Approximately 1 month ago I broke up with my now ex Gf. We were dating for approximately 4 months. Now it appears as though Tom and my ex are dating, or may be soon. Tom and my ex have been good friends before I met wither of them. 

   I'm not saying Tom should of asked for my blessing or premission, but a fair warning in advance or asking if I'm cool with it would of been appropriate, in my opinion necessary. 

   No one but my ex may know that I naturally still have some feelings. I'm alright with her dating anyone, but I feel as though he should of said something, if he is my friend. Relationships and feelings aren't forged overnight, they both must of have knew what was happening.

Keep in mind this is seniors in high school. I may add information upon request or remove information if I think I'm too identifiable. Thanks Reddit.
<bot>: Am I wrong for being angry and betrayed at Tom by him moving in on my ex without warning or is his infraction of the "bro code" unjustified?