How will I know if my boyfriend brother kind has a crush on me?

Anonymous
He hugs me all the time, Compliments me and he is always telling me how nice something is about me. He has bought several things from time to time like a cell phone which was a surprise but he ask his brother first. He's always touching me and asking what have I been up to. He seems so interested in what I do. We went out before and a group and he ask me to dance. When he hugs me he kisses me on my neck. I could go on. But the problem is he dates lots of women so I'm not sure.
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I notice one day he had to take me home. So he saw me hugging and kissing my boyfriend , His nature totally changed he really doesn't see us kissing. So he did a 360 he was still polite but different kinda he never does that. He started talking to the girl that came with him that day saying She was pretty, Kissing her hand and saying he would help take care of her. I new he didn't mean it. I was thinking to myself was he trying to make me jealous. But with you guy's comments I kinda know Thanks
How will I know if my boyfriend brother kind has a crush on me?
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