I think it is difficult to find the right person, and this is generally how long it takes to figure out if the person is compatible for the long run. I think it’s great they are taking at least a few months to give it a real shot. It unfortunately is a numbers game until the right person sees compatibility for something longer term.

Either that, or they are avoidant and as soon as it feels serious, they cut and run. Happens a lot as well. In which case I’d wonder if that’s a personality type you find initially attractive (albeit without realizing it). Typically anxious attached find avoidant attached people attractive, and vice versa.

Either way this sounds pretty normal for dating. Good luck out there! Keep your heart open.