You clearly say that a consequence of your approach is not giving her enough attention, that's why I said avoidance seems to be at the core of this issue, where there s no real solution to the core conflict leading to your regular fights, but mostly a decision to set yourself apart from her, what could have caused or triggered this sexual problem.
I do not know, but it seems to be a very good reason for it based on your story.
Only after carefully assessing your situation you could get to an accurate conclusion by yourselves, or if necessary with a mental health professional support.
Does it make sense?
Sex performance and fulfillment very strongly depend on the quality of the person and couple's emotional and psychological lives, on the quality and depth of their mutual trust, communication and intimacy. Thus sexual performance is very vulnerable to mood changes, stress, marital issues like lack of communication, disagreement, and many other problems-factors.
You could make your own evaluation - experiment here, and be more mindful and willingly work for one week to promote your communication, emotional intimacy, understanding, being truly patient, understanding and supportive, then during the weekend you would see how well is your sexual performance and level of fulfillment, Being more aware,, and monitoring the consistency between your mood and level of harmony and satisfaction in the relationship, with your sex life, would show you the connection between them, and how it may have been affecting you.
What does your girlfriend thinks about it?
Hello, can you read my responses?