Is it wrong for me to support this?

In August, I will be vegetarian for 5 years. Throughout those 5 years, I've gotten more strict on animal rights. I started dating my current boyfriend 2 1/2 years ago. He become vegetarian for me only after like 3 months of dating me. He has given up so much for me, I can't even express how much it means to me. Anyways, one of his favorite things to do is to fish. If he brings it up, I cut him off immediately and will hear nothing of it. I started seeing how upset it made him, so I did start to listen and to make him happy I told him I would start going fishing for him, but I wouldn't fish.. I would just watch. He doesn't really believe I'm going to do it because of how I am.. but I really want to make him happy. The only thing holding me back is that I'm scared it hurts the fish and I am 110% against any form of animal cruelty. Is it really cruel to fish? I'm not even sure anymore on that part. Sorry.. the question I'm trying to ask here is.. is it wrong for me to support my boyfriend fishing? and is it wrong for me to go with him and maybe fish myself? I would usually make up my own mind, but I'm so torn between the decisions that I don't know what to do.