How long should I wait?

Thomas and I never officially went out, and so when he officially chose someone else over me(don't judge him solely on this info, there's a lot to the story i'm not explaining) I went back to my ex, Jay. The entire time I was with Jay though, I still loved Thomas undoubtedly. I got butterflies whenever I was around him, or whenever he texted me. And because of the guilt of having feelings for someone other than my boyfriend, I drew out our relationship longer than it should've lasted. But I lost feelings for Jay about two months into our relationship. I still love Thomas and he still loves me, but I'm waiting for Jay's sake. I know that no matter how long I wait, it will be too soon for Jay. He doesn't let go easily. I don't want to hurt him anymore than I have. Going out with Thomas a few days after breaking up with Jay would be like a slap in the face to him. I want to remain single for a while anyways, I just don't know how long to wait. I'll be ready to get back out there in a couple of weeks, but I don't know if I should wait longer or not for Jay at least. Can I have some opinions?