Is it right to leave him due to this reason?

There's this guy who was chasing me since a long time, and I've been giving him positive signs of hope and he was looking forward to proceed with this but recently a girl who is not in good terms with me who acts like my rival in everything that I do started flirting with him and added him on Instagram. Although he stays at a distance with her she provokes him and goes to him and pushes him to cross boundaries with her. He is friendly to her even though he's maintaining a healthy distance she's building her hopes up and getting too involved in thoughts of him and pushing him to be in a relationship with her. He was still looking forward to express his feelings to me but I have avoided him altogether due to the reason that he was friends with the girl who is my rival. He doesn't know that she isn't in good terms with me and they became friends and he sees her as his friend but doesn't flirt with her. Even though it feels like an insult to me due to the fact that he became friends with her already and I'm avoiding him only due to the reason that he's friends with a girl who is actually seeing me as her competition and she is wanting me to be unsuccessful in everything else that we do which is not even related to love. This is the reason I don't wanna agree a relationship with him since he already became friends with her. Even if he was friends with another girl who was actually a good girl and who was friendly with me then I would have surely not bothered about it and would have agreed for being in a relationship with him but I lost complete interest to agree to his proposal and I wouldn't even want to associate to him as a friend. Is it right to avoid him altogether due to this reason?

Is it right to leave him due to this reason?
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