Need advice...I screwed up🙄

I already know I made a bad decision...I truly do not need anyone to tell me this, I am aware. Basically, I have been sleeping with my boss for the past 4 months or so. He is unmarried and completely single as am I... so nothing was morally wrong in that aspect. The problem is, I developed feelings for him, told him this a couple of weeks ago, was told that he didn’t NOT have feelings for me 🙄 but that he wasn’t in a place to be committed to a relationship. I realize this basically means he just wanted and wants sex. I tried to be strong and not sleep with him after this conversation, but I slipped up and did. He has always been a pretty big flirt in and outside of work not only with me but with other women as well...I truly believe this is just his personality (I’m not a flirty person by nature but I have many friends who are). The problem is, I get INSANELY jealous and anxious every time I see it happening in front of me. He is genuinely a nice dude (I think), it’s not his fault he doesn’t reciprocate the same feelings back for me and I never made it clear that I had feelings for him until months after we started hooking up and hanging out. I’m currently incredibly anxious about the situation and I’m not even at work right now, all because I saw him talking to a girl yesterday who was flirting more with him than he was with her. I know my ego is obviously bruised, but what are some things I can do to combat the feelings of anxiousness and jealousy I’m feeling? I’ve ruled out ever being able to “be” with him and have decided recently to no longer accept his requests to “hang out” as I know I will end up hooking up with him. While the job I have is one I could really find anywhere and make the same amount of money potentially, it’s also my biggest source of income right now and works with my schedule so well that it allows me to work other jobs that I truly love and got my degree for. Basically I am trying to not quit my job and get over my boss I have feelings for while working with him constantly. Any advice? Please only kind words...I know I screwed up, I do NOT need to hear the “don’t shit where you eat” saying at all...I am aware.