but he has been thinking how it would be to be with others girls.
Sorry, but he was letting you down easy, and leaving the door open just in case.
For your own good, see this as a break up, and he may NEVER come back. Sorry, again, and I hope I'm wrong, but I doubt it, as he probably already has others in mind to check out.
Please do not just wait for him, or take him back with open arms if he fails on his attempts to get with someone else. Don't have false hope because I know this hurts. Breaks/break ups, always hurts, and they SUCK, but only for a while. We heal, thrive, and survive them to be happy again.