Heartbroken

So my boyfriend of 5 months broke up with me the day after I told him I loved him because he realized he had feelings for another girl with a boyfriend. This happened about a month ago and ever since then he acts like I never existed. Lately I've been feeling so insecure about my face and my body, thinking they're not good enough or pretty enough or sexy enough and my self esteem has just been pretty down. I feel like I'm not funny enough or good looking enough because I'm not her...does any body have any tips to stop feeling like this? It just really sucks and I'd prefer to not feel disgusted by myself every time I look in the mirror y'know?