hmmm, i can understand why you would feel hurt, but if she had good relationships with them for the most part, then i can understand why she wants to stay in touch.

what i think is at the root of the issue here is that she's probably got some underlying insecurities and is afraid of being alone. she's probably scared that she'll end up being hurt (again- since you said that her previous relationships didn't end amicably).

it seems to me that your girlfriend is pre-emptively preparing herself for more hurt/pain, and in my honest opinion, i don't think that there's anything wrong with this, as long as she doesn't make you uncomfortable with her communications.

i think it was rather discourteous for her to take a call from him while the two of you were together, but it's reassuring that she ended the call when he started taking the conversation too far.

essentially, your girlfriend doesn't want to put all her eggs in one basket. it's a universal truth that when relationships end, pain is usually involved, so you may also find that she has some trust issues too.

my advice would be to have a chat with her about what you feel is 'too much' i.e. chatting to previous exes right in front of you, letting them feel that it's okay for them to be flirting with her etc (when it's in fact not okay).

perhaps ask her how she would feel if you were still very close to previous girlfriends and that you thought about getting back together with them in the event that your relationship with her didn't work out? say to her "i like to stay on good terms with them since it's very possible i'll date them again" or something along those lines.

relationships should be equal, and regardless of her reasons, if she wants this luxury then she needs to afford you the same luxury- if she doesn't want to, however (i am guessing she will hate the idea of you doing the same thing) then you need to have a sit down with her and discuss why it makes you feel uncomfortable.