Was I right to break up with my boyfriend of 18 months?

Long story short - we have been through hell and back. We have been together for almost 18 months and I ended it three days ago. He had been hanging out with his girl coworker late at night until 4 am. He bought her ice cream, they bought and named a fish together, and he even took her on vacation with his family a day before I was supposed to be there. He lied to me many times about them not hanging out anymore because it made me uncomfortable. He lied when he told me that all he has told her about our relationship was that we 'had problems'. Why would he tell her that anyway? He lied saying she had a boyfriend (she just ended a relationship three months ago with someone). When I went to drop off movies to his sister (who also works with them) the girl was there. She just looked at me. When I left, she asked his sister 'what is Julian's ex girlfriend doing here?' What the two of them doing is so inappropriate even if he says they're just friends. He wouldn't let me see his phone or his photos on Snapchat, because she was in his photos. They went to the beach and she got to meet his family. He followed her on instagram and liked one of her mirror selfies. I removed all contact with him and he deleted photos of me on social media. I'm heartbroken. He is manipulative and has emotional problems. I've always been his number one. his life saver. But now I am betrayed and replaced. I know what this girl is up to.
Was I right to break up with my boyfriend of 18 months?
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