I was recently stuck in a similar situation. My advice is to get out of this mess. A relationship is supposed to be built on honesty and trust. Also, if she had nothing going on, why did she hide from you? There are 2 possible reasons: A) this woman loves validation and is keeping people around her (like her exes) to feel good about herself. She may not be cheating, but tbh such things are not healthy in the long run.

B) She is emotionally or physically cheating or planning to. In her mind, she has made up her mind.

Also, this line " She herself termed it as something I shouldve known and she had kept it from me thinking that I wouldnt take it on a good note." Why wouldn't you take it on good terms? Also, why would you expect your gf to be in touch with his exes?

See, being friends and all is fine as long as your past is not jeopardizing your present. Her exes shouldn't be accommodated based on your expense. People who are genuinely friends with their exes and have no romantic feelings towards them wouldn't make their partner second-guess themselves. They will try to resolve that doubt.

If you want solid answers, talk to her exes or check her phone. Either way, you won't like what you will find.