Is it time for me to let go? F21 M23

I have been with my partner for nearly 5 years now. I met him in college and he is my first boyfriend and I am also his first girlfriend.

We’ve not always had a smooth sailing relationship, however we’ve always found a way to figure it out and meet in the middle in every disagreement we’ve had. I love him and i also know that he loves me a lot.

However, I can’t help myself but feel this sense of dissatisfaction in many ways. Although I love him dearly with my whole heart, one of the big issues I have in our relationship is that I am deeply dissatisfied with our sexual relationship. We started off very strong and over the years I noticed that it’s been happening less and less. We went long distance for three years as one of us had moved away for university, so naturally we weren’t seeing each other as often - therefore not having sex often. I feel like this had led to us having sex maybe once a month. However, now that we’ve moved back to our original city, we see each other nearly everyday. He has never gone down on me which is a big issue for me - I have communicated with him and he is aware that I am unable to orgasm from pure penetration which is what he’s always done. He claims that he wouldn’t know what to do and he does not feel comfortable going down on me. I’m very much willing to do everything however it’s coming to the point where I am deeply dissatisfied however am scared to leave just because of this issue as I feel that after all those years it “isn’t significant enough”. He just claims that his libido also hasn’t been very high, due to work stress etc. but it’s been months since he’s even touched me.

I am starting to feel that I am resenting him, almost as if I’m starting to feel attracted to other men who give me attention which has never been the case before. There are very little other issues that lead to my resentment - that’s a different story as these consist of little characteristics I find that I am no longer a fan of, especially in those years I’ve grown. I am stuck and I’m just not sure what to do. I’m very much a people pleaser and I find it extremely difficult to have confrontational conversations. I’ve tried to bring this up before and I’ve also tried to leave the relationship however he was extremely willing to work on everything which led me to stay but I am not sure what to do anymore.

I don’t want to think the grass is greener somewhere else because not always it is. I also don’t want to leave such a long relationship but don’t want to stay in one where I no longer feel fulfilled.