He’s getting soft quiet fast during sex now days..

My boyfriend and I has been having amazing sex for the past year now, but all of the sudden these past 4 times we have done it he gets soft while doing it. Like he would be doing so good but after about two positions he’s soft. It really doesn’t affect me in anyway of pleasuring cause I’m already thankful I have him and I love him a lot so I won’t get mad at him if he can’t pleasure me because he’s already an amazing guy. What gets to me is my self esteem though. It makes me overthink that I’m not good enough anymore or he’s tired of me or not attracted me at all. We’ve been together for 3 years and I can’t stop overthinking about this. And yes the first time he went soft with me was when I found a tumbler account t on his safari with a bunch of naked girls. He always told me he didn’t do that because he had me, but I didn’t realize that it’s been months since he ever asked me for some type of pictures ya know? Anyways.. what can I do? What can he do? He’s a very healthy guy and works out, he drinks no coffee at all too..

Please lmk!! -J💜