In your case, you still talked to Tyler and stil felt feelings for him even though
Leo caught your eye as well. Usually when
a break-
up occurs between 2 people that have been together for quite some time, you see them re-connect within the first month again, because the love and loneliness is just to much to handle. But in your case, that never happened. You moved on to Leo, which in this case is innocent and I can see why he is getting upset with you talking to Tyler.