Boyfriend thinks I flashed people doing yoga in the park—what now?

I dont wear pants because of religious reasons... we both went to the park... I was teaching him yoga... He accused me of flashing people in the park. Mind you Noone could see us where we were, I was wearing a long black dress... its hard working out in dresses sometimes. But I didn't show anything. So past days he was avoiding me... I called him today and he seemed very cold. I asked him what's wrong... he didn't say much at first. But than he said he was going to let me do my thing and I asked what he meant by that... he said that he didn't appreciate me flashing people in the park and he thought I was lady like. That hurt me because I wasn't trying to flash anyone... Noone was near us. he's been very distant.

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Another thing... when was about to leave the park... he was teaching me kick boxing moves. but he seem to get aggressive with me. Another thing. when I dont answer his calls for example. Im on the phone with my sister. He calls. I tell my sister I call her back and I call him back less than 5 min. and he questions me. Where we're you. what were you doing? And I tell him I was on the phone. he said with who? A man or a woman? Or if im out with family. he assumes a man was checking me out.
Boyfriend thinks I flashed people doing yoga in the park—what now?
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