I need words from the wise

Ladies...I'm feeling conflicted.

I met this guy off tinder.

I started talking to him and he was texting me every single morning telling me good morning. Conversations were always quite brief. So, we meet. Few weeks go by and I'm totally head over heels but don't mention anything of it. My birthday was last Friday. He text me and told me that " just so you know I'm completely fallen for you and I'm not letting you go" told him not to pull on my heartstrings and say things you don't mean.

Saturday, he calls me tells me to get dressed and that he's taking me somewhere and wouldn't tell me where. He takes me to kendra Scott and tells me to pick out the necklace that I want. He pays almost $100 for a necklace and then takes me out to eat. As I'm studying on quizlet after we leave the cafe. I look up and see a selfie sent to him from a blonde chick. That's all I seen. It was quick. It was like word vomit when I asked about it 15 minutes later. He said it was his sister and I knew he was lying. I just left it alone. Fast forward to us all going out that night. We go to an expensive steakhouse and then go out to a few bars. He gets kinda hammered and he tells me he loves me.several times. I never say it back. I told him to tell me when he meant it and sober. The next day we didn't get up until almost 2 because we didn't go to sleep until almost 7. He gets up and gives me some lame excuse as to how he had to go help put the pool up for winter. I knew it was shit but ya know. Now, its Wednesday and I wanna tell him that I just cant do this because I can't share. I know what I should do. I know. But please help me. He has still text me every morning but I'm almost positive he's with someone else this week. I know I sound stupid. Fuck, I know. I just like this fucker so much and I'm not sure what's gonna hurt worse...telling him that it's over and him possibly not giving a fuck or keep on and me feeling like this for however long until he decides to just ghost me.