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

Hey Reddit, so me and my gf of almost 4 years broke up a few weeks ago. It was a mutual breakup between us as we had a great 3+ years but it seemed like the last couple months we both just realized we wanted different things in life. We both realized it was best for us both to move on. It was hard on us both but for my best interest I decided to completely cut her off. I was then told by a close friend that she made out with a mutual friend of us both at a party. Part of me is telling myself to calm down as she's single and can do what she wants, the other part is definitely hurt as I feel disrespected by her and said mutual friend. What do you guys think? am I just being a baby or is it normal to feel this shitty?
<bot>: me and gf of 4 yrs mutually broke up, happy but decided best for us to move on find out she made out with close mutual friend 2 weeks later is okay to feel this shitty or am i a baby?