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LW's relationship with each of the boyfriends seems unhealthy and unproductive. And contrary to what the LW states, afternoon tete-a-tetes with an ex-boyfriend while living with the current boyfriend do not seem "on the up and up." Sounds very passive-aggressive to me. It's no wonder that the current bf moved out.
My advice to both suitors would be to run the other way and don't look back.