Le sigh

I'm dating a great guy, I'm sleeping with another not so great guy ( according to my standards), and said not so great guy is dating someone else while we stay shagging, I've been dating great guy for six years, I'm totally comfortable with great guy. I met not so great guy last year October, he's not even all that good in the sack but I keep going back to not so great guy and NO, feelings of intimacy has nothing to do with this, absolutely no feelings. I told myself I'd stop this year but it happened again today and I'm so miserable about it. I feel like I'm going to give up a great guy for nothing and I'm one of those people that detest being alone. I'm mad! and confused asf, uggggghhhh..... can't even explain myself better.