Erectile dysfunction? Pls help

Hey guys. My boyfriend and I have been together for over 4 years. At first we were having sex like everyday but over the time we started doing it less and less. In the past two years about 90 percent of the time we would start having sex he would go soft. Like every single time. The time where he doesn’t it’s just really bad. Like really fast to a point where I don’t even feel anything and I feel like he’s trying to cum before he goes soft. I don’t know what to do and I kinda feel like I’m losing my sexuality bc if you don’t use it you really lose it. I still masturbate and honestly prefer it to bad sex. Please give me advise if you’ve ever been in a relationship like this

**if you’re 12 or have not been in a relationship for longer than 6 months please don’t give me any advise.