I’m feeling unhappy due to the lack of a sexual relationship.

Hello, I'm a 24-year-old woman, and my partner is 23. Lately, we've been facing some challenges in our relationship. I have a high sex drive, which wasn't an issue for him at the beginning of our nearly one-year relationship. However, we've been having much less intimacy lately—typically just once a week for a few minutes without any foreplay, leaving me unfulfilled. I've expressed my feelings to him multiple times, and while he says he wants to improve things, there hasn't been any change. The main issue seems to be that he struggles to maintain an erection. I try to approach the situation with sensitivity and respect for his feelings, but I'm starting to feel neglected. I'm at a loss about what to do. The lack of intimacy is making me quite unhappy, yet I want to stay with him. Whenever I try to initiate, I'm usually met with rejection, and just thinking about our intimacy issues saddens me. I don’t want to pressure him into sex, but I also want to find a solution. Does anyone have any advice on how I can help improve our situation?