Im new to this

Does anyone else feel this way. I never had a lot of friends growing up but the friends that I did make are a big part of my life. I am finding out I am demisexual, and I'm scared that every good friend I get I'm going to get feelings for them.

Let me explain, back home I had a friend that I had from a very young age we did everything together and he started getting girlfriends and I will get annoyed it didn't connect that I was getting jealous and it didn't connect that I was falling for my friend. Long story short I never told him my feelings for him because he is straight and I am a guy. But we had a falling out and I moved away to start a new because I put all my friend eggs in that basket and never thought that we were going to stop being friends. I found out I loved him after I moved and would love to be with him.

When I moved I was really good friends with my boss also a male, also straight. We grew really close and he is now my best friend. I fear I am catching feelings for him even more than a friend. But now I have a boyfriend. I fear that I fall in love with any friend that becomes a close friend.

Am I alone here?