So picture this: You've been dating a guy for 2 years. He seems pretty perfect. You have similar interests and hobbies. He's an engineer for GE and makes good money. He's a few years older, but things are basically perfect. Suddenly, he breaks up with you and says that it's because he doesn't feel like he's "good enough" for you.
7 months of complete HELL go by and you're still trying to get over him when he suddenly emails you and says he misses you so much and really wants a second chance. You take him back. 4 years go by. In these four years you buy a house together and basically live like a married couple in what you think is complete and utter bliss. You become very close with all if his friends and he sort of becomes friends with yours (Some are still wary of him because of the break up) but once again, things appear to be perfect.
Then one night, you're spending the evening with one of your close mutual friends, and after several glasses of wine it comes out that he broke up with you in order to sleep with this mutual friend (whom he was adiment about you liking and getting close to!). He slept with her for the 7 months you weren't together (no, they were not in a "relationship") and then contacted you to try and rekindle things.
You are completely devastated because 1. He lied and said he did not sleep with anyone while you had been broken up. (You probably wouldn't have been mad since you weren't together, but it's the lying thing that's really eating at you.) and 2. He basically forced the girl he was screwing for 7 months onto you and made sure you became BEST friends. You're considering leaving him but you're scared because your life is completely entwined with his life. You'd have to deal with a lot of legal crap with the house and you don't really have anywhere else to go. Plus. you're pretty sure you love him. You tell him you really need some time to think about this and decide what is right for you.
Suddenly, only a month after his little secret comes to the surface, he proposes (even though after a total of 6 yrs together, he basically said he had no intention of getting married anytime soon even though he's 31.)
Seems a little fishy, eh?