My boyfriend forces me to use contraceptives

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I am 23 and in a relationship that I consider to be serious. My boyfriend however behaves in a somewhat strange manner which makes me doubt his seriousness towards me. He has been forcing me to use contraceptives for a long time now. Initially he would bring water to the bedside every morning, stand there and inspect my mouth thereafter to ascertain that I have swallowed the pill. I got tired of this and he forced me to get a five-year implant which he inspects every so often. I feel bad and don’t know what to do about it. I don’t feel appreciated and have been feeling like a slave in this relationship. Please help me understand what is going on here...{Conny}