Guy Help?

I've started crushing on my really close friend. We have a great relationship but I do think sometimes it crossed the border of being friends or being more because both of us are very cuddly/ touchy people so we're constantly cuddling/holding hands, though we both make comments a lot about how "it's never going to happen" but mostly when we say that it's referring to it sexually, and I'm not sexually attracted to him (I'm Demisexual). We defiantly have a good relationship where we care about each other a lot. However, we often make jokes in my group of friends of how "Ryan is a great friend but a horrible boyfriend" because in the past he's been in some unhealthy relationships that were unhealthy on both peoples parts and I'm afraid that if we started dating that would happen, and also our group of friends is very close and if something happens in our group between two people it's tense in our whole group and I don't want anything to happen between our group. Any advice?