An interesting turn of events

So I'm dating someone.

I started talking to him via an online dating sight several months ago.  We chatted for a while, stopped talking and then a few weeks ago he contacted me again.  We met up.  I liked him instantly.  He's tall, muscular and really nice. 

We had a few dates and then the sexting started.  Now, it's been 2 years for me since I've been in anything resembling a relationship so this was exciting for me.  We stayed up late sexting and then I would see him the next day and he would act like a gentleman.  I told him that I wasn't looking to jump into bed right away as sex seems to make me attached and I wanted to know a guy liked me before I put myself out there like that.  He was okay with that.

Last Friday we went out to dinner then back to his place to "watch a movie"  He put the movie in and we watched about the first 5 minutes of it and we started making out. It was thrilling.  He is an amazing kisser.  I forgot how much I like making out when the end result isn't necessarily sex.  We kissed and caressed and did some over the clothes rubbing but I kept my pants on.  I felt like a teenager.  After about 3 hours of that he drove me home.

Saturday night I didn't have my daughter so he came over to my place. I wasn't as well behaved.  We made out for a while.  I wanted him.  I am an adult and I can have sex if I want to so we did.  It was great.  He stayed the night and we made love a couple more times.  I haven't had sex like that since I was about 22.  It was passionate and sensual and satisfying.  I have butterflies even typing this right now.

He came over again last night and we hooked up again.  He had a lot to do yesterday and I was flattered that he made time to come see me.

Here's the thing.  Now that I have had sex with him I am just waiting for him to change his mind about me.  He waited all that time for me to put out and now that I have I am afraid he is going to lose interest.  Part of it is because I really like him.  We talk about things and about ourselves and he makes me feel incredibly sexy.  But the other part of it is my own issues.  I can't believe that anyone would like me.  I'm overweight (he likes curves) and I am socially awkward (he likes staying home). I think that's why I've stayed single for so long.  I don't think anyone would want to be with me long term. 

I am so afraid that this is going to turn into a little fling and he is going to lose interest. And by feeling like that I think I come across as desperate.  I have to summon all my will not to text him all day long.  I was so stand-offish when we first started talking.  I think he likes the chase.  At one point he actually said "you make me work for everything and I love it".  What happens when I try to open up and I show that I actually like him?  Does that ruin his image of me as hard to get? 

Holy shit.  I clearly need to be in therapy.  I can see how insane this all sounds.