I agree with everything Mark said, but to add to that, do you think it’s possible you were being a little critical or perhaps sounding a little critical to her? It’s hard for me to know because of what you didn’t specify, but for example… you said you helped her write a resume. Did she say she wanted to leave her job or were you just thinking she should because it doesn’t seem right for her so you were trying to help make that happen?

And for the apartment, I don’t blame her at all for not wanting to move in with someone she’d been dating officially for only 2 months, even with the situation with her dad. Did you get upset with her when she turned that down?

Communication is good, but if you were getting upset with her for a lot of things and vocalizing that, that could have lead to her thinking that she and her life was not right for you and your wants/needs… that you two weren’t meshing very well and were better off apart.

I also think that if you think you got nothing out of a 4-year relationship, you should reevaluate that relationship. There was probably something you very much needed to learn from that breakup that you might not have learned. All of those situations, at the very least, come with good, helpful lessons that make the relationship itself worth it.