I dont know Janna, its just odd. If the guy is into swimming i'd understand. Like he's a "redder" or a amateur swimmer. Then he'd look at it like asking a girl out to play a bit of tennis, or jogging, or cycling. Cause sport can be fun if both are interested into it.
Thing is, swimming is an odd pick if he doesnt have a prime relation towards it. Cause its relatively revealing. You can find it odd, but you are basically asking a person to strip down to glorified underwear.
Thing is. If you have no problem with doing this, just go and do it offcourse. You can consider his intentions later, because right now you have only questions, and afterwards you have several answers or things to analyse.
And if you lost weight, i seriously doubt you'd mind shopping for a bikini that suits your figure. If you like the guy, i suggest a tanga cut underpiece.
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I am very aware yes.