I've been unhappy lately and I don't know the reason is?

hey ya’ll, i’ve been unhappy lately and I don't know what the reason could be, I don't know if im unhappy because of my relationship or if im unhappy because i am don’t do anything for me. so let me explain, my life was very different a year ago, i had friends to talk to and hangout with all the time and now i don’t have any friends. second, i enjoyed my hobbies, which included going to the gym or walking around the park or tanning outside, now i dont do any of that. also my boyfriend and i are not connecting anymore. the relationship feels different. i also want to say that i feel a lot of resentment towards him. because at the beginning of the relationship all he did was like and follow bikini girls on instagram and it made me feel horrible about it, i asked him to stop and he never did until just recently. he stopped liking the pictures, but still follows them. it makes me feel unworthy. he says he’s sorry about it and that he never really knew what he wanted in the relationship until a few years ago and now he doesn’t like girls pictures. he will unfollow the girls if i ask him but since we don’t follow each other, i don’t know who else he follows. but anyway, we barely talk anymore, we don’t call much or text and we don’t hangout much either. we don’t go out on dates either so im bored. if we hangout, it’s at his house only, we won’t do anything fun. i had asked him once why we don’t and he says that it’s my fault because all i’ve done for a long time is argue with him about instagram and since he’s not doing it anymore it’s not fair to him to have to constantly be treated that way. but all i know is im not happy with myself. i look myself in the mirror and i don’t look happy, i feel empty and alone. i just know what is it. I don't know if it’s because i lost myself or if my relationship doesn’t bring me joy anymore.
I've been unhappy lately and I don't know the reason is?
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