I am a guy, and I realize your going through what my ex-gf went through after a year. After a while, a guy can start to lose the luster of sex, the excitement level may drop off. Example, I use to have sex about 2-5 times a day the first 4 months in the relationship. Then we'd find kinkier ways to do it, restroom, back seat of the car, in the trunk (hatchback), on the beach, on the balcony of the hotel, jacuzzi etc u get my point. Then after 7 to 8 months, we were looking to do it in public. So we kept pushing boundaries and it got to a point where our excitement had to keep going to the next level. Then I realized later on that our whole relationship was based on sex, even though we connected on a high emotional level too. At a point I was deeply in love for most of the duration of that year. But I was at a crossroads with my future, did I want to spend the rest of my life with this girl? Now this question only came after she gave me hints of moving in with her. So for me it was a combination of things, then I started getting angry at her so I could break up with her. I was 22 yrs old at the time, im 25 now. I knew in my heart after you fall in love with somebody, sometimes you have to look beyond the sex. I did so I left. I know this doesn't help at all, but if you want him to have more sex life before, your looking for the wrong answers.