My mind is everywhere, need advice.

I have been with my boyfriend for 5 years. The past year has been horrible! We have found out he has a sex addiction and I was brought to the light that he has cheated on me multiple times. I'm still trying to work through my feelings, but i'm so confused. I do love him, but I am not in love with him anymore. I don't find him as funny as I use to and now he can be so annoying. I feel like I want more space from him now more than I ever have, but we live together so it can be hard to get away from him sometimes. I am not a cheater and would NEVER cheat on him, but someone has started to catch my eye. I don't know if it's because I'm lonely and because of all the things my boyfriend has done to me. But I find myself thinking about this person quite often. To make it worse the person of interest is not only my friend, but also my boyfriends. I just really need some advice from you ladies.