I caught my boyfriend cheating so I did something?

So i saw that my boyfriend has a fake social media account. He was using it to speak to women & cheat. So i got his username, and i created a fake account. I spoke to him through that fake account. He continued to cheat with “me” he was so disgusting & disrespectful. Horny asf & talking about how he wants to marry “me”. I told him to break up with his girlfriend so we can be together & he started to cause problems out of nothing to end our relationship. I’m hurt & confused by his behaviour. Atp i am packing my bags to leave but I don't know if i should confront him about his account…
I caught my boyfriend cheating so I did something?
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