Side effects to sex?

Are they're any side effects to sex? The reason I ask, is because I had sex, with one guy, almost two years ago, within those two years, I didn't do it again until i got with the boyfriend I'm with now, the first time I had sex with him, I was fine, now it's been like three or four times and I love it, but for some reason, I've been so emotional over nothing. Sometimes I think he doesn't really like me, or I'm not good enough for him, and he never makes me feel these things, I just feel it on my own. Other times I get sad for no reason. I'm not sure if sex is the reason, I've never heard of anyone being like this before, but I'm just curious.. I don't know how to stop randomly being upset, I've never been like this before, not even on my period. I'm not on birth control, but we use condoms, and I know I'm not pregnant because my period just passed, any ideas or advice?

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