Does my friend's boyfriend like me?

So my best friend has just become an item with her best friend of 6 years. They seem so happy together too. But at times, I have a feeling that her boyfriend might like me.

We just recently started being friends and he's always suggesting to my best friend that I come along when they hang out, which she doesn't mind(yet). Here are the reasons I think her boyfriend might like me:

-He's let me know a couple of times that he thinks I'm pretty

-He wants me to hang out with them whenever possible

-There are some things he says or does(like winking at me) that he tells me not to tell my friend

-Whenever he hugs me, his arms wrap around my lower back

-He's asked me to sit up front with him when driving and lets me mess with the radio, but wont let his girlfriend touch it.

-He sometimes makes sexual jokes like we all should have a 3-some

-He always initiates the hugs

I know these may sound like for sure reasons but the only reason I doubt it is because he seems so happy with my best friend and it seems like he loves her a lot.