Yeah thats the issue... you start off fine! Then slowly get ground into literally complete insanity, where you actually forget who you even were, what you stood for as a man, and where you stand with anything. Its all consuming, and tiring, and demoralising, and generally just a rubbish way to live LIFE. Who wants that? Sometimes you have to go through it at least once, in order to say to yourself never, ever again, and have the experience to spot these behaviour patterns before you get too emtionally attached.
Like I said before, its happened to MARINES, bodybuilders, the strongest men you could imagine. There is no shame in this, people underestimate the emtional power and hold some women can excersise over men, but thats fine isnt it guys? Thats "liberalism" or feminism or whatever.
Having a HEALTHY relationship and maintaining ATTRACTION is all about staying true to yourself....your woman is doing something you are not happy with? You must call it out, you must articulate your feelings and make it known you do not find this a way to be treated. It can only go two ways...:- you either get respected for it and things change for the better, or she just doesnt care how you feel at all, in which case they are not worth having as a partner.
A relationship is a partnership, its a two way street. Its not all about a guy constantly feeling insecure and wondering about where he stands fearful of ever putting a foot wrong and treading on eggshells for the entire time paranoid he has upset the woman. Thats not a relationship, thats emotional abuse.
PS if it was me in the position of my girl going off for dinner with a "guy friend" Id make a joke... something like "well baby, you are looking so sexy tonight no wonder he wants to take you out, you just call if he cant keep his hands to himself!" or something like that. Not go into MELTDOWN and let it ruin my day. Ultimately, if someones gonna cheat, they are gonna cheat and there is not a damn thing you can do about it. Women dont cheat when they are getting what they need/want at home. If they are not, then its easy to spot the warning signs and do something about it before its too late. Unfortunatly, we are pretty bad as men for spotting these signs, and end up shocked, hurt and upset, when the inevitable happens and she leaves/cheats/meets someone else "out of the blue" (to us) but has really been unhappy for ages.