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How to make him chase you and want to commit

I have been in a relationship with a guy for a month (not serious or full on commitment yet).Today I asked him if he likes me or likes me for sex. He said he likes me for me and got upset about it..he was pissed and wouldn't talk to me or look at me. He was like I just can't beleive of what you thought of me. The reason I was uncertain is because he rarely text me like before (dont need to text all the time)..and I accidently saw a message to his friend that he kissed a guy when he was drunk. I just want ways to make him want only me and would chase me again like before. I starting to like him alot and I want him to feel like we are exclusive.