(It rather sounds not, which is good.) If he does feel the need to experiment, can your relationship withstand the stresses, and can you withstand the temptation to throw things at him? Even more important, can you forswear wallowing in guilt for something you did not do and were in fact powerless to affect in any way? If so, great — go forth and pursue whatever it is you hope to pursue with Semipoly Dude. If you answered "no" to any but the first of my too many questions, then your relationship, lovely as it is, is fated to be brief and end either badly later or amicably now. So I hope you didn't.