Do I have feelings for him ?

Hey guys, so ive just turned 18 last week and currently studying year 12, I’ve known this guy for 3/4 years now and we have been such good friends, he’s the most caring honest comforting guy I could ever ask for, he’s always there for me, he always checks up on me he always makes me laugh and whever im not around him I feel lost. He’s just started having this thing with this girl - just this week- and I’ve been seeing them hanging around school together, him really touchy with her and seeing eachother outside of school - just this weekend. I don’t know why but there’s a feeling inside me of being a little jealous and sad seeing him be so happy around someone else, I care about his happiness tho and I’m glad to see him be so happy but it wreaks me a little being like that with someone else. I don’t know whether there feelings or not, I feel like it’s just because all of my best friends are in relashionships and feel lonely and want someone there with me don’t get me wrong I’m defiantly looking for love but is it with him ?