is this stupid of me or no?

Hello Ladies, so I may be just over reacting of course, but it has been on my mind for way to long. I'm 22, my boyfriend is 28 (ya I know, a gap) we have been together for 3 years, moved to Hawai'i together and love it. But still after all this time he continues to follow different naked models, searching for them and saving them. it bothers me because since our move I haven't been working out like I use to and have became more jiggly. I don't know if it's a sexual thing or just a "man" thing. help me? am I over thinking it. Am I maybe just not pleasing him?