I heard a great expression once: ‘the best way to get rid of your enemy is to make them your friend’. There is another expression: ‘keep your friends close but your enemies closer’. All in all, a great way to deal with your enemy or someone you don’t get on with is to change your relationship with them. You might be surprised at how they react to your altered behaviour.
I remember 20 or so years ago when I was working in an International School in Swanage: I just couldn’t get on with one of the other teachers. Mainly I think because my first interaction with her was a negative one. One day we were walking into town together with some students; we struck up a conversation which very quickly moved onto the subject of why we didn’t get on. Within 5 minutes we agreed that it was because we were so similar! From that moment on we got on like a house on fire (I’ve never understood that saying).
Often just taking the time to get to know someone can make all the difference.