So, the past several months I've felt horribly confused. I can't tell if it's depression or if I just stopped feeling feelings.. I don't feel sad, I occasionally feel angry, and rarely happy/excited. This lack of emotion has me acting out in ways I never thought I would and I can't figure the source of my .. whatever this is.

My boyfriend and I have been together for four years, it is [or, was] a healthy relationship,he's a great guy, we get along great etc. For some reason the sex got incredibly boring. I had tried speaking with him countless occasions on why I'm unhappy with our sex life and nothing changed. Months later I cheated on him. I tried telling him we needed a break because I didn't know where my head was, I needed some time to myself. That worked for about a day. We're still together, and I am still cheating. I don't know why I'm doing it, I don't know why I don't feel bad, I'm quite literally destroying my own life as well as someone else's and I have no clue what I'm doing or why I'm doing it. Is it a phase? I don't feel any excitement out of cheating, I don't feel anything.