Am I really in love?

I know this is a question you should always be able to answer yourself. But lately, I find it incredibly confusing and difficult.
I have a wonderful boyfriend who loves me entirely. And up until recently, I was convinced I loved him too. But the more I think about it, the more I realize that many of the reasons why I love him are rooted in him loving me. For instance, I love him because:
-I trust him completely
-He is really supportive
-He cares about my well being
-He makes me feel good about myself
-He makes me happy
There are other things about his character, like we have fun together, he makes me laugh, and he is very patient and reasonable. For all these reasons, I am very happy and stable in this relationship, and in all aspects, he’s a great boyfriend.

However… I feel like something is missing. Even at the beginning of our relationship, I never felt much passion, and as our intimacy increased, it felt like love. But it’s always felt companionate—never hot passion. He is like a friend that I find really attractive. I don’t feel the deep-rooted connection, the “same wavelength” sort of thing, I don’t feel as if he’s my “soul mate.” But when we’re lying in bed together in the mornings I feel so extraordinarily peaceful and happy. It’s confusing. Perhaps my intimacy and attraction to him are clouding my judgment. Sometimes I admit to myself, if he didn’t love me so much, I’m not sure I would love him.
Even though I’m happy, sometimes I wonder if I’m settling, and if this relationship needs more.
I suppose many of you will say I answered my own question. I just don’t want to ruin a good thing yet, but I feel like waiting might make it worse.