It’s not easy but you should tell him sooner rather than later that you don’t envision a relationship working out. Don’t be like me with my first husband. We were friends in college and I apparently was desperate for affection because I settled for him, got married, had a kid with him, and basically wasted over 14 yrs before getting a divorce. I settled because I wasn’t attracted to him. Being funny and sweet and having my same interests was nice in the beginning, but you can’t ever have a healthy relationship without chemistry. He was a good kisser too but initiating sex and any sort of affection was difficult for me because I didn’t feel compelled to do so. Don’t get stuck in something like I did just because you don’t want to be mean.