Frustrated

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So recently I got engaged after 9 years! We are high school sweet hearts however things has not always been peaches and cream. However, I have moved passed all the curb balls that has been thrown my way and loved him despite of it all due to the fact we were kids when most of his wrongs have occurred. But now I still feel a bit unhappy. Not sure if I’m just used to being by myself seeing as though we was separated for 3 years, or if it’s because he’s now accusing me of cheating. I don’t know whether to call everything off or to work things out. I try to make him happy however nothing seems to work. Constant arguments, when this is supposed to be the most happiest time of my life. Idk what to do! He says I’m not affectionate but it’s hard to be when ur constantly being accused of something that you are not doing.