It is tricky to hold onto long-distance relationships. There are a lot of barriers between you. I haven't ever been in a long-distance relationship, myself, so it's tough to imagine what the best thing to do would be.

You talk with her daily ~ which is nice. But that sure isn't the same as actually being there. Since you both have told one another that you love each other, have you made any plans for the future? Is there a plan to meet in the middle, or for one of you to move to the other's area? Have either of you brought it up? If so, who? Do you both agree on the outcome?

I think that it would be entirely healthy and fair for you to tell your gf that you feel uncomfortable with her ex in the picture. I'd advise you to word things very carefully: I feel ___, I am afraid of ___, etc. Meaning, tell her how you feel. Focus on your feelings and thoughts, being careful not to imply any assumptions that the ex or your gf may be doing ___. Otherwise, people automatically jump into defense and arguments quickly become intense.

Hopefully, your gf will listen to how you're feeling. You miss her. You want to see her again. You want to be closer (physically and emotionally). Whatever. The point is how YOU feel. Perhaps just sharing this with your gf will be what you're both needing. Intimacy. If your gf were to say that she feels the same, etc, maybe then you could bring up how you're feeling about her ex being in her life. That it makes you feel uncomfortable, scared of losing her, and you don't want to feel this way anymore. What can be done to make these bad feelings go away? Something that she could respond to ~ with reassurance. Working through things together is very healthy for the relationship.

That's my advice. Hope that it wasn't too long or confusing for you. Best wishes!