I need some advice on this break up?

I have been with this guy for 3 year. He is a business owner I went to his business place for the first time and there was a gurl that worked there and I heard people saying that they were involved and he even drinked a juice and gave her the rest and they drank off the same bottle. No one knew we were together as yet. I asked him y they were saying that and why they drank off the sane bottle. He got mad and a few days later he told me its over between us and he slept with her because I listened to what people saud and asked him about it so I will cheat on him so he starts having sex first. Was I being insecured? He even blocked me after calling him.

I need some advice on this break up?
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