Is my girlfriend making excuses to break up?

My girlfriend just broke up with me because of a minor mistake: i forgot to call her back after i ended the phone call telling her to wait for me a moment, as i was busy and i really forgot, she then called me back getting really mad and broke up with me. Next day, i came to her company to pick her up, she came out holding a bunch of flowers. I asked who gave her the flowers but she wouldn't reply, she said that it’s none of my business since from yesterday, im already her ex, she still wanted to break up as she mentioned all the small mistakes i did in the past such as forgetting to call her (she never call me first), being late for a few minutes or not buying her gifts often,... Im feeling confused, why did she receive flowers from another guy in her company and want to break up with me suddenly? Is she been cheating on me with that guy and making excuses to break up? What should i do now?
Is my girlfriend making excuses to break up?
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