I had to end things for good and I don’t feel good

He and I were together for 3 straight years and he met all of my family and I was so sure I’d be married to him and then I kept finding pictures of celebrities, girls I know in his phone. This clearly upset me and hurt me because he had a whole girlfriend and still wanted or was showing he wanted more. I am struggling to find my own peace as I have depended on him for 3 years and then having to end things against my will. If anybody has advice please 🙏🏽