Lasting

So me and my boyfriend have been having sex for a few months now and I've had sex previously with a virgin and he grew out of the cumming fast stage in about a week, it's been months and my boyfriend who was also a virgin still cannot last longer than a minute....we've tried everything. Long lasting condoms, no condoms, no foreplay before, foreplay before, nothing is working! If anybody has any tips or personal tricks please let me know!