I need serious help

Okay so I’m ‘talking’ to this guy and we both having feelings for each other but he has commitment issues. I have wasted my time once with a guy, I was with him for 7 months but then it didn’t workout. I don’t want this to happen again but I just don’t know what to do. He is the most amazing guy that I have ever been with. An issue came up at work with this other guy who likes me. He’s been joking around with me and saying all these dirty jokes and I don’t feel anything for him so I joke around about shit with him but when he drove me home from work I kissed him on the cheek. I know that’s not a big deal but me and the guy that I’m talking to are big on trust. I can’t tell him or it would ruin what we have but I also can’t not tell him because I’ll feel guilty. What should I do !!??!