I think Tinder would get you better chance to find Thai guys who interested in dating and not just sex.
The biggest issue would be language barrier, but I have a friend who is dating a Thai guy who speaks 0 English and they're getting along just fine.
You can start from making new friends with local guys. Go to regular bars (not the one with boys who work there only for money)
One thing I learn from getting new friends from gay bar in Bangkok is that all the local gay circles are connected.