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If it were behind my back I would be pissed, with that situation I would try laying ground rules. Explaine your situation and the concern it creates, if he wants to hang out you should be present. If she is completely unwilling to come to a compromise and continues hanging out at all hours tell her again what it's doing to you... If you have suspicions and don't feel like your her number 1 anymore, get out... I have never had a good experience with girls seeing their ex's
I'd put an end that nonsense right away. If having a little talk with the ex behind the bushes has to happen so be it. It's not about jealousy it's about respect.