Sex with an ex

It has been already three months since I last slept with him. We broke up in November and at the New Year's Eve it happened for the first time. So - here is the list of the advanages which I recognized while it was still ok to sleep with him:
1) The sex itself was much better than when we were together
2) Everytime we did not know whether there was going to be any kind of resumption, so everytime it was like it was the last time and everytime it was the best
3) It is comfortable to sleep with somebody on whom you know what works and so does he, it is really a big benefit
4) You put away all that love, stress and future stuff away and just enjoy the physical part of what is happening (which, later experience shows is also a big disadvantage at the same time)
5) In case it was him who ended the relationship having sex with an ex is giving you hope that he still cares about you and he will find out, what he was missing without you. This hope fulfills you with feeling of being good at both - in bed and also being a good partner. However, lately you just recognize it is not like that. He will not return to you and all that it is about is just having sex. Here we go with the disadvantages which may appear lately than the advantages, but be sure, they will come.
1) It is exhausting. It really is from both perspectives - physically, you must have all the things prepared in any time, when you still feel wanting him back. I even used to buy his favourite stuff for breakfast and keep it at my place and then just threw it away. And mentally it is exhausting because your brain is constantly working. You cannot stop thinking about last night or when will be the next time or whether there is going to be any newt time.
2) You never know, whether he is sleeping with other women. Asking him will mean that you are making problems and you are not going to see him again. Not asking him may be a problem in connection with all those illnesses, deseases and whatever you really do not want to hear about.
3) It will not end good. Face it. There is no even a little possibility of this having a happy end.
4) Facing it is stronger than you, so then when it comes and you are never seeing each other any more, when the final ending is here it breaks you. Do you think that you were completely broke when he ended the relationship? No, honey. This is the one and only end that will hurt you in all the little nice places left in your heart and it will change you a lot.
5) Since this ended, he's been behaving ok, feeling no trouble while you are still completely down. And when I say completely, I mean it.
6) All the advantages mentioned above are lately disadvantages. If you are having such a great sex together, why the fuck didn't you do it while you were still together - that is after 'will there a any next time' the second question asked in your head when you've finished. Is love an obstackle in having the best sex ever?
7) Damn, there are too many disadvantages, I don't wanna face it. It is my time to understand I still care about him and he still can have me any time he would like to. I am not showing this fact, but deep inside of me I still know he can have me and I want him to.