Breakup Truth - Part 2

So, he went for clubbing with that guy a day before we broke up and had a great time and that is when she thought that he might be into heras well. Few weeks after we broke up she asked that guy out and turns out he just saw her as a friend and nothing else. After all this she also went out with another guy who turned out to be a dick. This is when she decided to give me another chance All this feels really weird. I don't know what was real anymore. I feel betrayed. I get it that nothing happened between them physically but can't get over the emotional infidelity. Part of me feels like "in the end she came back to me so does it really matter?" but part of me is also really scared about be in a so replaceable. How long until someone else comes along and she does the same thing again? What should I do?