Anika, it's not your fault and you don't have to feel ashamed or angry. Some men are like that and you cannot change them even if you are strong and bold enough. As your office has no HR and any particular rules, it's better to quit or maintain distance from him. Men like this can go to any extreme if there is no one to question them over there. I don't know how long he has been working there and he may have the upper hand over there. If he is texting personal things like miss you and all and taking pictures/selfies with you on regular basis, it will become a problem in your marriage life too in the future. Better you talk to your husband too about this.