It there should be a time limit. If you don't trust him after 6m then maybe you shouldn't be with him anyways. If it hasn't been 6m yet, I think when ever your ready will be fine. Just know if your not in a relationship they can and may sleep wit other people. I've known men to wait, but it's on the dude. If he seems genuinely interested and you both would like to be together then be together and let things come naturally. Don't do anything your not comfortable doing, but also know 6m is a very long time.
HA I'm dealing with this now it's a very complicated relationship but I'm almost going on 6 months no sex yet.. but we had a talk about 2 weeks ago and I addressed this and she said she still wanted me to.
I think like you she's scared to be pumped and dumped. But I assure you that's not going to happen, almost each time she pushed me away I was still beside her