Why is she so into my relationship status?

it's this one female friend I have we talked and laughed for an hour and a half. we was talking about some of everything. so she went to asking me do I have a gf(she asks every 3 or 4 weeks.) she asked me why and I told her. the last time she asked was week before valentine's. I asked her ws she single she said yea was like I thought you had a boyfriend she said they broke up week before Christmas. now out of no where she goes to saying what he bought her for Valentine's day and Christmas. she told me on Valentine's day she was upset because this was her first time being single on v-day. out of the blue she goes talking about her boyfriend then she asks me do I have a girlfriend and why not. she seemed so into my relationship status. when I talk to another female or about another female she seems jealous and she changes the subject or get in our convo saying she don't want to talk to you leave her alone. today she went to messing with her hair saying she need her hair done and she asked me how it looked(it didn't look bad to me) then she went on by saying how her body looks to me.(she has a banging body) ...my thing is if you have a boyfriend why would you care what I think?...MY OTHER QUESTIONS ARE WHY SHE SO INTO MY RELATIONSHIP STATUS SHE ASKS EVERY 3 OR 4 WEEKS AND WHY DO SHE SEEM TO GET JEALOUS WHEN I TALK TO OR ABOUT OTHER FEMALES?
Why is she so into my relationship status?
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