Every woman has needs, and she's no different. You're not satisfying her, and unfortunately you've never been able to and you never will. You don't have what it takes, the size, the skills, the know how. You're not a real man, truth be told. She deserves pleasure. She deserves to be pleased and FUCKED properly. Of COURSE she's cheating on you! Why wouldn't she be? What's between your legs is nothing but a teeny tiny disappointment. You're much better off as her cuck, and a slave for her use in the ways you can be useful. Get used to waiting around for her to come home and serving her as her cuck. You're far better suited to being her cuckold slave than her lover!