Hey there,

I've been with this girl for 2 months and we're exclusive. Great sex, she's attached to me, follows etc. I'm thinking of breaking up with her because of my own insecurities. Don't get me wrong, I'm comfident, alpha and girls like me. Thing is I have a fear of getting serious, I mean exposing myself to trust her and therefore possibly get hurt. Never had a oneitis before. Her ex, most likely making up stories, is making me uncertain on whether I should trust her or not. How do I bring this up this trust thing and my fear of relationships as a possible problem if I want to fix it instead of breaking up with her and without sounding AFC? Telling her about my feelings and being indecisive is a big no-no, I'm trying to get round that.

Sounds like you're dancing to the Ex-s flute. Tell him to eat a dick and use your own experiences to make judgements of this girl. Or at the very least, people who are not interested in shaping your opinion one way or another.
Don't bring anything up with her. Don't expose yourself or trust her until she wins the trust through her own actions. Don't get lovey dovey and keep a little distance. You can let yourself become more involved with time, but even then, don't focus all your attention on her.
Don't break up unless you actually don't want to be with her. If you do anyways, you'll probably regret it and end up running back to her, but by then the ex will be banging away.

Don't break up with someone through a fear of getting serious, you will potentially ruin a good thing and regret it and then when you try to get her back, she will realise you're riddled with insecurity and won't want to know. I know from experience.

Wait for her to initiate the "are we bf/gf?" conversation. Don't listen to stories about her from other people, judge her yourself because the stories are most likely exaggerated and embellished if not plain bullshit.

Great advice from both